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95035f33 M |
1 | /* |
2 | * libalsa output driver. This file is part of Shairport. | |
3 | * Copyright (c) Muffinman, Skaman 2013 | |
129343c1 | 4 | * Copyright (c) Mike Brady 2014 -- 2022 |
95035f33 M |
5 | * All rights reserved. |
6 | * | |
7 | * Permission is hereby granted, free of charge, to any person | |
8 | * obtaining a copy of this software and associated documentation | |
9 | * files (the "Software"), to deal in the Software without | |
10 | * restriction, including without limitation the rights to use, | |
11 | * copy, modify, merge, publish, distribute, sublicense, and/or | |
12 | * sell copies of the Software, and to permit persons to whom the | |
13 | * Software is furnished to do so, subject to the following conditions: | |
14 | * | |
15 | * The above copyright notice and this permission notice shall be | |
16 | * included in all copies or substantial portions of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
19 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | |
20 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
21 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
22 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
23 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
24 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
25 | * OTHER DEALINGS IN THE SOFTWARE. | |
26 | */ | |
27 | ||
28 | #define ALSA_PCM_NEW_HW_PARAMS_API | |
29 | ||
064bd293 | 30 | #include <alsa/asoundlib.h> |
76c5dd92 | 31 | #include <inttypes.h> |
ba02dee4 | 32 | #include <math.h> |
064bd293 | 33 | #include <memory.h> |
689063ce | 34 | #include <pthread.h> |
064bd293 MB |
35 | #include <stdio.h> |
36 | #include <unistd.h> | |
95035f33 | 37 | |
8b589879 MB |
38 | #include "config.h" |
39 | ||
8b589879 MB |
40 | #include "activity_monitor.h" |
41 | #include "audio.h" | |
c8b0be30 | 42 | #include "common.h" |
8b589879 | 43 | |
bd81e733 MB |
44 | enum alsa_backend_mode { |
45 | abm_disconnected, | |
46 | abm_connected, | |
47 | abm_playing | |
48 | } alsa_backend_state; // under the control of alsa_mutex | |
49 | ||
83c0405d | 50 | typedef struct { |
c8b0be30 MB |
51 | snd_pcm_format_t alsa_code; |
52 | int frame_size; | |
83c0405d MB |
53 | } format_record; |
54 | ||
fd880056 MB |
55 | int output_method_signalled = 0; // for reporting whether it's using mmap or not |
56 | int delay_type_notified = -1; // for controlling the reporting of whether the output device can do | |
57 | // precision delays (e.g. alsa->pulsaudio virtual devices can't) | |
58 | int use_monotonic_clock = 0; // this value will be set when the hardware is initialised | |
59 | ||
95035f33 | 60 | static void help(void); |
c56a9ee2 | 61 | static int init(int argc, char **argv); |
95035f33 | 62 | static void deinit(void); |
01e51285 | 63 | static void start(int i_sample_rate, int i_sample_format); |
fd880056 MB |
64 | static int play(void *buf, int samples, __attribute__((unused)) int sample_type, |
65 | __attribute__((unused)) uint32_t timestamp, | |
66 | __attribute__((unused)) uint64_t playtime); | |
95035f33 | 67 | static void stop(void); |
2c40f23f | 68 | static void flush(void); |
fd880056 MB |
69 | static int delay(long *the_delay); |
70 | static int stats(uint64_t *raw_measurement_time, uint64_t *corrected_measurement_time, | |
71 | uint64_t *the_delay, uint64_t *frames_sent_to_dac); | |
56bef8e7 | 72 | |
fd880056 | 73 | static void *alsa_buffer_monitor_thread_code(void *arg); |
2915e667 | 74 | |
95035f33 | 75 | static void volume(double vol); |
fd880056 MB |
76 | static void do_volume(double vol); |
77 | static int prepare(void); | |
78 | static int do_play(void *buf, int samples); | |
fc492bea | 79 | |
87a0475c | 80 | static void parameters(audio_parameters *info); |
fd880056 | 81 | static int mute(int do_mute); // returns true if it actually is allowed to use the mute |
c1316621 | 82 | static double set_volume; |
e513e533 MB |
83 | audio_output audio_alsa = { |
84 | .name = "alsa", | |
85 | .help = &help, | |
86 | .init = &init, | |
87 | .deinit = &deinit, | |
83c0405d | 88 | .prepare = &prepare, |
e513e533 MB |
89 | .start = &start, |
90 | .stop = &stop, | |
8cabb16f | 91 | .is_running = NULL, |
e513e533 MB |
92 | .flush = &flush, |
93 | .delay = &delay, | |
94 | .play = &play, | |
14bfba27 MB |
95 | .stats = &stats, // will also include frames of silence sent to stop |
96 | // standby mode | |
97 | // .rate_info = NULL, | |
555bb97a MB |
98 | .mute = NULL, // a function will be provided if it can, and is allowed to, |
99 | // do hardware mute | |
100 | .volume = NULL, // a function will be provided if it can do hardware volume | |
2737222b | 101 | .parameters = NULL}; // a function will be provided if it can do hardware volume |
95035f33 | 102 | |
fd880056 MB |
103 | pthread_mutex_t alsa_mutex = PTHREAD_MUTEX_INITIALIZER; |
104 | pthread_mutex_t alsa_mixer_mutex = PTHREAD_MUTEX_INITIALIZER; | |
689063ce | 105 | |
7cc434e9 MB |
106 | pthread_t alsa_buffer_monitor_thread; |
107 | ||
555bb97a MB |
108 | // for deciding when to activate mute |
109 | // there are two sources of requests to mute -- the backend itself, e.g. when it | |
110 | // is flushing | |
111 | // and the player, e.g. when volume goes down to -144, i.e. mute. | |
112 | ||
113 | // we may not be allowed to use hardware mute, so we must reflect that too. | |
114 | ||
115 | int mute_requested_externally = 0; | |
116 | int mute_requested_internally = 0; | |
117 | ||
46a13dce | 118 | // for tracking how long the output device has stalled |
555bb97a MB |
119 | uint64_t stall_monitor_start_time; // zero if not initialised / not started / |
120 | // zeroed by flush | |
121 | long stall_monitor_frame_count; // set to delay at start of time, incremented by | |
122 | // any writes | |
123 | uint64_t stall_monitor_error_threshold; // if the time is longer than this, it's | |
124 | // an error | |
46a13dce | 125 | |
fd880056 | 126 | snd_output_t *output = NULL; |
7cc434e9 | 127 | int frame_size; // in bytes for interleaved stereo |
83504880 | 128 | |
555bb97a MB |
129 | int alsa_device_initialised; // boolean to ensure the initialisation is only |
130 | // done once | |
cd9982c4 | 131 | |
f7717745 | 132 | yndk_type precision_delay_available_status = |
c8b0be30 MB |
133 | YNDK_DONT_KNOW; // initially, we don't know if the device can do precision delay |
134 | ||
9fb37e42 | 135 | snd_pcm_t *alsa_handle = NULL; |
449e024c MB |
136 | int alsa_handle_status = |
137 | ENODEV; // if alsa_handle is NULL, this should say why with a unix error code | |
fd880056 MB |
138 | snd_pcm_hw_params_t *alsa_params = NULL; |
139 | snd_pcm_sw_params_t *alsa_swparams = NULL; | |
140 | snd_ctl_t *ctl = NULL; | |
141 | snd_ctl_elem_id_t *elem_id = NULL; | |
142 | snd_mixer_t *alsa_mix_handle = NULL; | |
143 | snd_mixer_elem_t *alsa_mix_elem = NULL; | |
144 | snd_mixer_selem_id_t *alsa_mix_sid = NULL; | |
145 | long alsa_mix_minv, alsa_mix_maxv; | |
146 | long alsa_mix_mindb, alsa_mix_maxdb; | |
147 | ||
148 | char *alsa_out_dev = "default"; | |
149 | char *alsa_mix_dev = NULL; | |
150 | char *alsa_mix_ctrl = NULL; | |
151 | int alsa_mix_index = 0; | |
152 | int has_softvol = 0; | |
8a4bfb03 | 153 | |
4046c0e7 | 154 | int64_t dither_random_number_store = 0; |
8a4bfb03 | 155 | |
fd880056 | 156 | int volume_set_request = 0; // set when an external request is made to set the volume. |
555bb97a MB |
157 | |
158 | int mixer_volume_setting_gives_mute = 0; // set when it is discovered that | |
159 | // particular mixer volume setting | |
160 | // causes a mute. | |
161 | long alsa_mix_mute; // setting the volume to this value mutes output, if | |
162 | // mixer_volume_setting_gives_mute is true | |
e0aa75a8 MB |
163 | int volume_based_mute_is_active = |
164 | 0; // set when muting is being done by a setting the volume to a magic value | |
95035f33 | 165 | |
aac57c9c | 166 | // use this to allow the use of snd_pcm_writei or snd_pcm_mmap_writei |
c8b0be30 | 167 | snd_pcm_sframes_t (*alsa_pcm_write)(snd_pcm_t *, const void *, snd_pcm_uframes_t) = snd_pcm_writei; |
8e847aa4 | 168 | |
76387f82 MB |
169 | void handle_unfixable_error(int errorCode) { |
170 | if (config.unfixable_error_reported == 0) { | |
171 | config.unfixable_error_reported = 1; | |
172 | char messageString[1024]; | |
173 | messageString[0] = '\0'; | |
174 | snprintf(messageString, sizeof(messageString), "output_device_error_%d", errorCode); | |
175 | if (config.cmd_unfixable) { | |
176 | command_execute(config.cmd_unfixable, messageString, 1); | |
177 | } else { | |
178 | die("An unrecoverable error, \"output_device_error_%d\", has been " | |
b7d9c22d MB |
179 | "detected. Doing an emergency exit, as no run_this_if_an_unfixable_error_is_detected " |
180 | "program.", | |
76387f82 MB |
181 | errorCode); |
182 | } | |
183 | } | |
184 | } | |
185 | ||
fd880056 MB |
186 | static int precision_delay_and_status(snd_pcm_state_t *state, snd_pcm_sframes_t *delay, |
187 | yndk_type *using_update_timestamps); | |
188 | static int standard_delay_and_status(snd_pcm_state_t *state, snd_pcm_sframes_t *delay, | |
189 | yndk_type *using_update_timestamps); | |
aac57c9c | 190 | |
c8b0be30 MB |
191 | // use this to allow the use of standard or precision delay calculations, with standard the, uh, |
192 | // standard. | |
193 | int (*delay_and_status)(snd_pcm_state_t *state, snd_pcm_sframes_t *delay, | |
f7717745 | 194 | yndk_type *using_update_timestamps) = standard_delay_and_status; |
aac57c9c | 195 | |
dbea82c2 MB |
196 | // this will return true if the DAC can return precision delay information and false if not |
197 | // if it is not yet known, it will test the output device to find out | |
198 | ||
199 | // note -- once it has done the test, it decides -- even if the delay comes back with | |
200 | // "don't know", it will take that as a "No" and remember it. | |
201 | // If you want it to check again, set precision_delay_available_status to YNDK_DONT_KNOW | |
202 | // first. | |
203 | ||
fd880056 | 204 | static int precision_delay_available() { |
dbea82c2 | 205 | if (precision_delay_available_status == YNDK_DONT_KNOW) { |
c8b0be30 MB |
206 | // this is very crude -- if the device is a hardware device, then it's assumed the delay is |
207 | // precise | |
7013b0cc | 208 | const char *output_device_name = snd_pcm_name(alsa_handle); |
0b03f237 | 209 | int is_a_real_hardware_device = 0; |
210 | if (output_device_name != NULL) | |
211 | is_a_real_hardware_device = (strstr(output_device_name, "hw:") == output_device_name); | |
7013b0cc MB |
212 | |
213 | // The criteria as to whether precision delay is available | |
dbea82c2 | 214 | // is whether the device driver returns non-zero update timestamps |
1ca92262 | 215 | // If it does, and the device is a hardware device (i.e. its name begins with "hw:"), |
c8b0be30 MB |
216 | // it is considered that precision delay is available. Otherwise, it's considered to be |
217 | // unavailable. | |
218 | ||
dbea82c2 | 219 | // To test, we play a silence buffer (fairly large to avoid underflow) |
c8b0be30 | 220 | // and then we check the delay return. It will tell us if it |
dbea82c2 | 221 | // was able to use the (non-zero) update timestamps |
c8b0be30 | 222 | |
dbea82c2 MB |
223 | int frames_of_silence = 4410; |
224 | size_t size_of_silence_buffer = frames_of_silence * frame_size; | |
225 | void *silence = malloc(size_of_silence_buffer); | |
226 | if (silence == NULL) { | |
227 | debug(1, "alsa: precision_delay_available -- failed to " | |
228 | "allocate memory for a " | |
229 | "silent frame buffer."); | |
230 | } else { | |
231 | pthread_cleanup_push(malloc_cleanup, silence); | |
232 | int use_dither = 0; | |
e8a92d3c | 233 | if ((alsa_mix_ctrl == NULL) && (config.ignore_volume_control == 0) && |
dbea82c2 MB |
234 | (config.airplay_volume != 0.0)) |
235 | use_dither = 1; | |
236 | dither_random_number_store = | |
237 | generate_zero_frames(silence, frames_of_silence, config.output_format, | |
238 | use_dither, // i.e. with dither | |
239 | dither_random_number_store); | |
dbea82c2 MB |
240 | do_play(silence, frames_of_silence); |
241 | pthread_cleanup_pop(1); | |
242 | // now we can get the delay, and we'll note if it uses update timestamps | |
f7717745 | 243 | yndk_type uses_update_timestamps; |
dbea82c2 | 244 | snd_pcm_state_t state; |
c8b0be30 | 245 | snd_pcm_sframes_t delay; |
9199bf24 | 246 | int ret = precision_delay_and_status(&state, &delay, &uses_update_timestamps); |
c8b0be30 MB |
247 | // debug(3,"alsa: precision_delay_available asking for delay and status with a return status |
248 | // of %d, a delay of %ld and a uses_update_timestamps of %d.", ret, delay, | |
249 | // uses_update_timestamps); | |
dbea82c2 | 250 | if (ret == 0) { |
7013b0cc | 251 | if ((uses_update_timestamps == YNDK_YES) && (is_a_real_hardware_device)) { |
dbea82c2 | 252 | precision_delay_available_status = YNDK_YES; |
c8b0be30 | 253 | debug(2, "alsa: precision delay timing is available."); |
dbea82c2 | 254 | } else { |
7013b0cc | 255 | if ((uses_update_timestamps == YNDK_YES) && (!is_a_real_hardware_device)) { |
c8b0be30 MB |
256 | debug(2, "alsa: precision delay timing is not available because it's not definitely a " |
257 | "hardware device."); | |
7013b0cc | 258 | } else { |
c8b0be30 MB |
259 | debug(2, "alsa: precision delay timing is not available."); |
260 | } | |
261 | precision_delay_available_status = YNDK_NO; | |
dbea82c2 MB |
262 | } |
263 | } | |
264 | } | |
265 | } | |
266 | return (precision_delay_available_status == YNDK_YES); | |
1d32976d MB |
267 | } |
268 | ||
cbc4caa6 MB |
269 | int alsa_characteristics_already_listed = 0; |
270 | ||
fd880056 MB |
271 | snd_pcm_uframes_t period_size_requested, buffer_size_requested; |
272 | int set_period_size_request, set_buffer_size_request; | |
2c40f23f | 273 | |
fd880056 | 274 | uint64_t frames_sent_for_playing; |
136071a6 | 275 | |
dc5b8f1a MB |
276 | // set to true if there has been a discontinuity between the last reported frames_sent_for_playing |
277 | // and the present reported frames_sent_for_playing | |
850fda10 | 278 | // Note that it will be set when the device is opened, as any previous figures for |
dc5b8f1a | 279 | // frames_sent_for_playing (which Shairport Sync might hold) would be invalid. |
fd880056 | 280 | int frames_sent_break_occurred; |
c85e7e05 | 281 | |
95035f33 | 282 | static void help(void) { |
552218ab MB |
283 | printf(" -d output-device set the output device, default is \"default\".\n" |
284 | " -c mixer-control set the mixer control name, default is to use no mixer.\n" | |
285 | " -m mixer-device set the mixer device, default is the output device.\n" | |
286 | " -i mixer-index set the mixer index, default is 0.\n"); | |
c8b0be30 MB |
287 | int r = system("if [ -d /proc/asound ] ; then echo \" hardware output devices:\" ; ls -al " |
288 | "/proc/asound/ 2>/dev/null | grep '\\->' | tr -s ' ' | cut -d ' ' -f 9 | while " | |
289 | "read line; do echo \" \\\"hw:$line\\\"\" ; done ; fi"); | |
4bafe1c9 MB |
290 | if (r != 0) |
291 | debug(2, "error %d executing a script to list alsa hardware device names", r); | |
95035f33 M |
292 | } |
293 | ||
fd880056 | 294 | void set_alsa_out_dev(char *dev) { alsa_out_dev = dev; } // ugh -- not static! |
3e9e2285 | 295 | |
277d401d | 296 | // assuming pthread cancellation is disabled |
76387f82 | 297 | // returns zero of all is okay, a Unx error code if there's a problem |
fd880056 | 298 | static int open_mixer() { |
ea20840d | 299 | int response = 0; |
e8a92d3c | 300 | if (alsa_mix_ctrl != NULL) { |
2efab6ee | 301 | debug(3, "Open Mixer"); |
d414c07e MB |
302 | snd_mixer_selem_id_alloca(&alsa_mix_sid); |
303 | snd_mixer_selem_id_set_index(alsa_mix_sid, alsa_mix_index); | |
304 | snd_mixer_selem_id_set_name(alsa_mix_sid, alsa_mix_ctrl); | |
305 | ||
76387f82 | 306 | if ((response = snd_mixer_open(&alsa_mix_handle, 0)) < 0) { |
76c5dd92 | 307 | debug(1, "Failed to open mixer"); |
ea20840d MB |
308 | } else { |
309 | debug(3, "Mixer device name is \"%s\".", alsa_mix_dev); | |
76387f82 | 310 | if ((response = snd_mixer_attach(alsa_mix_handle, alsa_mix_dev)) < 0) { |
76c5dd92 | 311 | debug(1, "Failed to attach mixer"); |
ea20840d | 312 | } else { |
76387f82 | 313 | if ((response = snd_mixer_selem_register(alsa_mix_handle, NULL, NULL)) < 0) { |
76c5dd92 | 314 | debug(1, "Failed to register mixer element"); |
ea20840d | 315 | } else { |
76387f82 | 316 | if ((response = snd_mixer_load(alsa_mix_handle)) < 0) { |
76c5dd92 | 317 | debug(1, "Failed to load mixer element"); |
ea20840d | 318 | } else { |
6ced6bc6 | 319 | debug(3, "Mixer control is \"%s\",%d.", alsa_mix_ctrl, alsa_mix_index); |
ea20840d MB |
320 | alsa_mix_elem = snd_mixer_find_selem(alsa_mix_handle, alsa_mix_sid); |
321 | if (!alsa_mix_elem) { | |
6ced6bc6 | 322 | warn("failed to find mixer control \"%s\",%d.", alsa_mix_ctrl, alsa_mix_index); |
76387f82 | 323 | response = -ENXIO; // don't let this be ENODEV! |
ea20840d MB |
324 | } |
325 | } | |
326 | } | |
327 | } | |
328 | } | |
d414c07e | 329 | } |
ea20840d | 330 | return response; |
ae0c9745 MB |
331 | } |
332 | ||
277d401d | 333 | // assuming pthread cancellation is disabled |
76387f82 MB |
334 | static int close_mixer() { |
335 | int ret = 0; | |
e513e533 | 336 | if (alsa_mix_handle) { |
76387f82 | 337 | ret = snd_mixer_close(alsa_mix_handle); |
e513e533 MB |
338 | alsa_mix_handle = NULL; |
339 | } | |
76387f82 | 340 | return ret; |
eb1b7c37 MB |
341 | } |
342 | ||
277d401d | 343 | // assuming pthread cancellation is disabled |
76387f82 MB |
344 | static int do_snd_mixer_selem_set_playback_dB_all(snd_mixer_elem_t *mix_elem, double vol) { |
345 | int response = 0; | |
346 | if ((response = snd_mixer_selem_set_playback_dB_all(mix_elem, vol, 0)) != 0) { | |
8a4bfb03 | 347 | debug(1, "Can't set playback volume accurately to %f dB.", vol); |
76387f82 MB |
348 | if ((response = snd_mixer_selem_set_playback_dB_all(mix_elem, vol, -1)) != 0) |
349 | if ((response = snd_mixer_selem_set_playback_dB_all(mix_elem, vol, 1)) != 0) | |
8a4bfb03 MB |
350 | debug(1, "Could not set playback dB volume on the mixer."); |
351 | } | |
76387f82 | 352 | return response; |
8a4bfb03 | 353 | } |
f7077e70 | 354 | |
c8b0be30 MB |
355 | // This array is a sequence of the output rates to be tried if automatic speed selection is |
356 | // requested. | |
83c0405d MB |
357 | // There is no benefit to upconverting the frame rate, other than for compatibility. |
358 | // The lowest rate that the DAC is capable of is chosen. | |
359 | ||
360 | unsigned int auto_speed_output_rates[] = { | |
54d761ff MB |
361 | 44100, |
362 | 88200, | |
363 | 176400, | |
364 | 352800, | |
83c0405d MB |
365 | }; |
366 | ||
c8b0be30 MB |
367 | // This array is of all the formats known to Shairport Sync, in order of the SPS_FORMAT definitions, |
368 | // with their equivalent alsa codes and their frame sizes. | |
369 | // If just one format is requested, then its entry is searched for in the array and checked on the | |
370 | // device | |
83c0405d MB |
371 | // If auto format is requested, then each entry in turn is tried until a working format is found. |
372 | // So, it should be in the search order. | |
c8b0be30 MB |
373 | |
374 | format_record fr[] = { | |
375 | {SND_PCM_FORMAT_UNKNOWN, 0}, // unknown | |
376 | {SND_PCM_FORMAT_S8, 2}, {SND_PCM_FORMAT_U8, 2}, {SND_PCM_FORMAT_S16, 4}, | |
aeb46892 | 377 | {SND_PCM_FORMAT_S16_LE, 4}, {SND_PCM_FORMAT_S16_BE, 4}, {SND_PCM_FORMAT_S24, 8}, |
c8b0be30 MB |
378 | {SND_PCM_FORMAT_S24_LE, 8}, {SND_PCM_FORMAT_S24_BE, 8}, {SND_PCM_FORMAT_S24_3LE, 6}, |
379 | {SND_PCM_FORMAT_S24_3BE, 6}, {SND_PCM_FORMAT_S32, 8}, {SND_PCM_FORMAT_S32_LE, 8}, | |
380 | {SND_PCM_FORMAT_S32_BE, 8}, {SND_PCM_FORMAT_UNKNOWN, 0}, // auto | |
381 | {SND_PCM_FORMAT_UNKNOWN, 0}, // illegal | |
382 | }; | |
383 | ||
384 | // This array is the sequence of formats to be tried if automatic selection of the format is | |
385 | // requested. | |
386 | // Ideally, audio should pass through Shairport Sync unaltered, apart from occasional interpolation. | |
387 | // If the user chooses a hardware mixer, then audio could go straight through, unaltered, as signed | |
388 | // 16 bit stereo. | |
389 | // However, the user might, at any point, select an option that requires modification, such as | |
390 | // stereo to mono mixing, | |
391 | // additional volume attenuation, convolution, and so on. For this reason, | |
392 | // we look for the greatest depth the DAC is capable of, since upconverting it is completely | |
393 | // lossless. | |
394 | // If audio processing is required, then the dither that must be added will | |
395 | // be added at the lowest possible level. | |
396 | // Hence, selecting the greatest bit depth is always either beneficial or neutral. | |
397 | ||
f7717745 | 398 | sps_format_t auto_format_check_sequence[] = { |
c8b0be30 MB |
399 | SPS_FORMAT_S32, SPS_FORMAT_S32_LE, SPS_FORMAT_S32_BE, SPS_FORMAT_S24, SPS_FORMAT_S24_LE, |
400 | SPS_FORMAT_S24_BE, SPS_FORMAT_S24_3LE, SPS_FORMAT_S24_3BE, SPS_FORMAT_S16, SPS_FORMAT_S16_LE, | |
401 | SPS_FORMAT_S16_BE, SPS_FORMAT_S8, SPS_FORMAT_U8, | |
402 | }; | |
83c0405d | 403 | |
4046c0e7 | 404 | // assuming pthread cancellation is disabled |
83c0405d MB |
405 | // if do_auto_setting is true and auto format or auto speed has been requested, |
406 | // select the settings as appropriate and store them | |
fd880056 | 407 | static int actual_open_alsa_device(int do_auto_setup) { |
4046c0e7 MB |
408 | // the alsa mutex is already acquired when this is called |
409 | const snd_pcm_uframes_t minimal_buffer_headroom = | |
410 | 352 * 2; // we accept this much headroom in the hardware buffer, but we'll | |
411 | // accept less | |
412 | /* | |
413 | const snd_pcm_uframes_t requested_buffer_headroom = | |
414 | minimal_buffer_headroom + 2048; // we ask for this much headroom in the | |
555bb97a MB |
415 | // hardware buffer, but we'll accept |
416 | less | |
4046c0e7 | 417 | */ |
87a0475c | 418 | |
4046c0e7 | 419 | int ret, dir = 0; |
c8b0be30 MB |
420 | unsigned int |
421 | actual_sample_rate; // this will be given the rate requested and will be given the actual rate | |
4046c0e7 MB |
422 | // snd_pcm_uframes_t frames = 441 * 10; |
423 | snd_pcm_uframes_t actual_buffer_length; | |
424 | snd_pcm_access_t access; | |
e5452e51 | 425 | |
555bb97a MB |
426 | // ensure no calls are made to the alsa device enquiring about the buffer |
427 | // length if | |
4046c0e7 MB |
428 | // synchronisation is disabled. |
429 | if (config.no_sync != 0) | |
430 | audio_alsa.delay = NULL; | |
e513e533 | 431 | |
555bb97a MB |
432 | // ensure no calls are made to the alsa device enquiring about the buffer |
433 | // length if | |
4046c0e7 MB |
434 | // synchronisation is disabled. |
435 | if (config.no_sync != 0) | |
436 | audio_alsa.delay = NULL; | |
c56a9ee2 | 437 | |
4046c0e7 | 438 | ret = snd_pcm_open(&alsa_handle, alsa_out_dev, SND_PCM_STREAM_PLAYBACK, 0); |
449e024c MB |
439 | // EHOSTDOWN seems to signify that it's a PipeWire pseudo device that can't be accessed by this |
440 | // user. So, try the first device ALSA device and log it. | |
441 | if ((ret == -EHOSTDOWN) && (strcmp(alsa_out_dev, "default") == 0)) { | |
442 | ret = snd_pcm_open(&alsa_handle, "hw:0", SND_PCM_STREAM_PLAYBACK, 0); | |
443 | if ((ret == 0) || (ret == -EBUSY)) { | |
444 | // being busy should be okay | |
445 | inform("the default ALSA device is inaccessible -- \"hw:0\" used instead.", alsa_out_dev); | |
446 | set_alsa_out_dev("hw:0"); | |
447 | } | |
448 | } | |
129343c1 MB |
449 | if (ret == 0) { |
450 | if (alsa_handle_status == -EBUSY) | |
449e024c MB |
451 | warn("The output device \"%s\" is no longer busy and will be used by Shairport Sync.", |
452 | alsa_out_dev); | |
129343c1 MB |
453 | alsa_handle_status = ret; // all cool |
454 | } else { | |
455 | alsa_handle = NULL; // to be sure to be sure | |
456 | if (ret == -EBUSY) { | |
457 | if (alsa_handle_status != -EBUSY) | |
449e024c MB |
458 | warn("The output device \"%s\" is busy and can't be used by Shairport Sync at present.", |
459 | alsa_out_dev); | |
129343c1 | 460 | debug(2, "the alsa output_device \"%s\" is busy.", alsa_out_dev); |
84eecaf7 | 461 | } |
129343c1 MB |
462 | alsa_handle_status = ret; |
463 | frames_sent_break_occurred = 1; | |
1d32976d | 464 | return ret; |
d3072ae8 | 465 | } |
5a8241c7 | 466 | |
4046c0e7 MB |
467 | snd_pcm_hw_params_alloca(&alsa_params); |
468 | snd_pcm_sw_params_alloca(&alsa_swparams); | |
87a0475c | 469 | |
4046c0e7 MB |
470 | ret = snd_pcm_hw_params_any(alsa_handle, alsa_params); |
471 | if (ret < 0) { | |
449a9be5 | 472 | die("audio_alsa: Broken configuration for device \"%s\": no configurations " |
c8b0be30 MB |
473 | "available", |
474 | alsa_out_dev); | |
284cb9d3 | 475 | return ret; |
4046c0e7 | 476 | } |
312bcd03 | 477 | |
4046c0e7 MB |
478 | if ((config.no_mmap == 0) && |
479 | (snd_pcm_hw_params_set_access(alsa_handle, alsa_params, SND_PCM_ACCESS_MMAP_INTERLEAVED) >= | |
480 | 0)) { | |
481 | if (output_method_signalled == 0) { | |
482 | debug(3, "Output written using MMAP"); | |
483 | output_method_signalled = 1; | |
87a0475c | 484 | } |
4046c0e7 MB |
485 | access = SND_PCM_ACCESS_MMAP_INTERLEAVED; |
486 | alsa_pcm_write = snd_pcm_mmap_writei; | |
487 | } else { | |
488 | if (output_method_signalled == 0) { | |
489 | debug(3, "Output written with RW"); | |
490 | output_method_signalled = 1; | |
87a0475c | 491 | } |
4046c0e7 MB |
492 | access = SND_PCM_ACCESS_RW_INTERLEAVED; |
493 | alsa_pcm_write = snd_pcm_writei; | |
494 | } | |
744214df | 495 | |
4046c0e7 MB |
496 | ret = snd_pcm_hw_params_set_access(alsa_handle, alsa_params, access); |
497 | if (ret < 0) { | |
1ca4ebcf | 498 | die("audio_alsa: Access type not available for device \"%s\": %s", alsa_out_dev, |
c0a3dacf | 499 | snd_strerror(ret)); |
284cb9d3 | 500 | return ret; |
4046c0e7 | 501 | } |
064bd293 | 502 | |
4046c0e7 MB |
503 | ret = snd_pcm_hw_params_set_channels(alsa_handle, alsa_params, 2); |
504 | if (ret < 0) { | |
1ca4ebcf | 505 | die("audio_alsa: Channels count (2) not available for device \"%s\": %s", alsa_out_dev, |
c0a3dacf | 506 | snd_strerror(ret)); |
284cb9d3 | 507 | return ret; |
4046c0e7 | 508 | } |
e513e533 | 509 | |
042d9404 | 510 | snd_pcm_format_t sf; |
c8b0be30 | 511 | |
83c0405d | 512 | if ((do_auto_setup == 0) || (config.output_format_auto_requested == 0)) { // no auto format |
c8b0be30 MB |
513 | if ((config.output_format > SPS_FORMAT_UNKNOWN) && (config.output_format < SPS_FORMAT_AUTO)) { |
514 | sf = fr[config.output_format].alsa_code; | |
515 | frame_size = fr[config.output_format].frame_size; | |
516 | } else { | |
517 | warn("alsa: unexpected output format %d. Set to S16_LE.", config.output_format); | |
518 | config.output_format = SPS_FORMAT_S16_LE; | |
519 | sf = fr[config.output_format].alsa_code; | |
520 | frame_size = fr[config.output_format].frame_size; | |
521 | } | |
522 | ret = snd_pcm_hw_params_set_format(alsa_handle, alsa_params, sf); | |
523 | if (ret < 0) { | |
c5dafbd2 MB |
524 | die("audio_alsa: Alsa sample format %d not available for device \"%s\": %s", sf, alsa_out_dev, |
525 | snd_strerror(ret)); | |
c8b0be30 MB |
526 | return ret; |
527 | } | |
83c0405d | 528 | } else { // auto format |
c8b0be30 | 529 | int number_of_formats_to_try; |
f7717745 | 530 | sps_format_t *formats; |
c8b0be30 MB |
531 | formats = auto_format_check_sequence; |
532 | number_of_formats_to_try = sizeof(auto_format_check_sequence) / sizeof(sps_format_t); | |
533 | int i = 0; | |
534 | int format_found = 0; | |
f7717745 | 535 | sps_format_t trial_format = SPS_FORMAT_UNKNOWN; |
c8b0be30 MB |
536 | while ((i < number_of_formats_to_try) && (format_found == 0)) { |
537 | trial_format = formats[i]; | |
538 | sf = fr[trial_format].alsa_code; | |
539 | frame_size = fr[trial_format].frame_size; | |
540 | ret = snd_pcm_hw_params_set_format(alsa_handle, alsa_params, sf); | |
541 | if (ret == 0) | |
542 | format_found = 1; | |
543 | else | |
544 | i++; | |
545 | } | |
546 | if (ret == 0) { | |
547 | config.output_format = trial_format; | |
3b4a21f0 | 548 | debug(2, "alsa: output format chosen is \"%s\".", |
c8b0be30 MB |
549 | sps_format_description_string(config.output_format)); |
550 | } else { | |
1ca4ebcf | 551 | die("audio_alsa: Could not automatically set the output format for device \"%s\": %s", |
c0a3dacf | 552 | alsa_out_dev, snd_strerror(ret)); |
c8b0be30 MB |
553 | return ret; |
554 | } | |
20967812 | 555 | } |
c8b0be30 | 556 | |
83c0405d | 557 | if ((do_auto_setup == 0) || (config.output_rate_auto_requested == 0)) { // no auto format |
c8b0be30 MB |
558 | actual_sample_rate = |
559 | config.output_rate; // this is the requested rate -- it'll be changed to the actual rate | |
560 | ret = snd_pcm_hw_params_set_rate_near(alsa_handle, alsa_params, &actual_sample_rate, &dir); | |
561 | if (ret < 0) { | |
c0a3dacf MB |
562 | die("audio_alsa: The frame rate of %i frames per second is not available for playback: %s", |
563 | config.output_rate, snd_strerror(ret)); | |
c8b0be30 MB |
564 | return ret; |
565 | } | |
566 | } else { | |
567 | int number_of_speeds_to_try; | |
568 | unsigned int *speeds; | |
569 | ||
570 | speeds = auto_speed_output_rates; | |
571 | number_of_speeds_to_try = sizeof(auto_speed_output_rates) / sizeof(int); | |
572 | ||
573 | int i = 0; | |
574 | int speed_found = 0; | |
575 | ||
576 | while ((i < number_of_speeds_to_try) && (speed_found == 0)) { | |
577 | actual_sample_rate = speeds[i]; | |
578 | ret = snd_pcm_hw_params_set_rate_near(alsa_handle, alsa_params, &actual_sample_rate, &dir); | |
579 | if (ret == 0) { | |
580 | speed_found = 1; | |
581 | if (actual_sample_rate != speeds[i]) | |
c0a3dacf MB |
582 | die("The output DAC can not be set to %d frames per second (fps). The nearest speed " |
583 | "available is %d fps.", | |
584 | speeds[i], actual_sample_rate); | |
c8b0be30 MB |
585 | } else { |
586 | i++; | |
587 | } | |
588 | } | |
589 | if (ret == 0) { | |
590 | config.output_rate = actual_sample_rate; | |
3b4a21f0 | 591 | debug(2, "alsa: output speed chosen is %d.", config.output_rate); |
c8b0be30 | 592 | } else { |
1ca4ebcf | 593 | die("audio_alsa: Could not automatically set the output rate for device \"%s\": %s", |
c0a3dacf | 594 | alsa_out_dev, snd_strerror(ret)); |
c8b0be30 MB |
595 | return ret; |
596 | } | |
597 | } | |
598 | ||
4046c0e7 | 599 | if (set_period_size_request != 0) { |
854942df | 600 | debug(1, "Attempting to set the period size to %lu", period_size_requested); |
4046c0e7 MB |
601 | ret = snd_pcm_hw_params_set_period_size_near(alsa_handle, alsa_params, &period_size_requested, |
602 | &dir); | |
603 | if (ret < 0) { | |
604 | warn("audio_alsa: cannot set period size of %lu: %s", period_size_requested, | |
605 | snd_strerror(ret)); | |
284cb9d3 | 606 | return ret; |
4046c0e7 MB |
607 | } else { |
608 | snd_pcm_uframes_t actual_period_size; | |
609 | snd_pcm_hw_params_get_period_size(alsa_params, &actual_period_size, &dir); | |
610 | if (actual_period_size != period_size_requested) | |
555bb97a MB |
611 | inform("Actual period size set to a different value than requested. " |
612 | "Requested: %lu, actual " | |
4046c0e7 MB |
613 | "setting: %lu", |
614 | period_size_requested, actual_period_size); | |
fc492bea | 615 | } |
4046c0e7 | 616 | } |
e513e533 | 617 | |
4046c0e7 MB |
618 | if (set_buffer_size_request != 0) { |
619 | debug(1, "Attempting to set the buffer size to %lu", buffer_size_requested); | |
620 | ret = snd_pcm_hw_params_set_buffer_size_near(alsa_handle, alsa_params, &buffer_size_requested); | |
621 | if (ret < 0) { | |
622 | warn("audio_alsa: cannot set buffer size of %lu: %s", buffer_size_requested, | |
623 | snd_strerror(ret)); | |
284cb9d3 | 624 | return ret; |
4046c0e7 MB |
625 | } else { |
626 | snd_pcm_uframes_t actual_buffer_size; | |
627 | snd_pcm_hw_params_get_buffer_size(alsa_params, &actual_buffer_size); | |
628 | if (actual_buffer_size != buffer_size_requested) | |
555bb97a MB |
629 | inform("Actual period size set to a different value than requested. " |
630 | "Requested: %lu, actual " | |
4046c0e7 MB |
631 | "setting: %lu", |
632 | buffer_size_requested, actual_buffer_size); | |
01e51285 | 633 | } |
4046c0e7 | 634 | } |
01e51285 | 635 | |
4046c0e7 MB |
636 | ret = snd_pcm_hw_params(alsa_handle, alsa_params); |
637 | if (ret < 0) { | |
1ca4ebcf | 638 | die("audio_alsa: Unable to set hw parameters for device \"%s\": %s.", alsa_out_dev, |
c0a3dacf | 639 | snd_strerror(ret)); |
284cb9d3 | 640 | return ret; |
f7077e70 | 641 | } |
ae0c9745 | 642 | |
bd81e733 | 643 | // check parameters after attempting to set them |
ea20840d | 644 | |
4046c0e7 MB |
645 | if (set_period_size_request != 0) { |
646 | snd_pcm_uframes_t actual_period_size; | |
647 | snd_pcm_hw_params_get_period_size(alsa_params, &actual_period_size, &dir); | |
648 | if (actual_period_size != period_size_requested) | |
555bb97a MB |
649 | inform("Actual period size set to a different value than requested. " |
650 | "Requested: %lu, actual " | |
4046c0e7 MB |
651 | "setting: %lu", |
652 | period_size_requested, actual_period_size); | |
0f14aad8 | 653 | } |
277d401d | 654 | |
4046c0e7 MB |
655 | if (set_buffer_size_request != 0) { |
656 | snd_pcm_uframes_t actual_buffer_size; | |
657 | snd_pcm_hw_params_get_buffer_size(alsa_params, &actual_buffer_size); | |
658 | if (actual_buffer_size != buffer_size_requested) | |
555bb97a MB |
659 | inform("Actual period size set to a different value than requested. " |
660 | "Requested: %lu, actual " | |
4046c0e7 MB |
661 | "setting: %lu", |
662 | buffer_size_requested, actual_buffer_size); | |
22a8664d | 663 | } |
ae0c9745 | 664 | |
f13f22d8 | 665 | if (actual_sample_rate != config.output_rate) { |
0f1118c1 | 666 | die("Can't set the output DAC to the requested frame rate of %d fps.", config.output_rate); |
284cb9d3 | 667 | return -EINVAL; |
8e847aa4 | 668 | } |
c8b0be30 MB |
669 | |
670 | use_monotonic_clock = snd_pcm_hw_params_is_monotonic(alsa_params); | |
8e847aa4 | 671 | |
4046c0e7 | 672 | ret = snd_pcm_hw_params_get_buffer_size(alsa_params, &actual_buffer_length); |
22a8664d | 673 | if (ret < 0) { |
4046c0e7 | 674 | warn("audio_alsa: Unable to get hw buffer length for device \"%s\": %s.", alsa_out_dev, |
76c5dd92 | 675 | snd_strerror(ret)); |
284cb9d3 | 676 | return ret; |
0499743b | 677 | } |
4046c0e7 MB |
678 | |
679 | ret = snd_pcm_sw_params_current(alsa_handle, alsa_swparams); | |
22a8664d | 680 | if (ret < 0) { |
555bb97a MB |
681 | warn("audio_alsa: Unable to get current sw parameters for device \"%s\": " |
682 | "%s.", | |
683 | alsa_out_dev, snd_strerror(ret)); | |
284cb9d3 | 684 | return ret; |
ae0c9745 MB |
685 | } |
686 | ||
4046c0e7 | 687 | ret = snd_pcm_sw_params_set_tstamp_mode(alsa_handle, alsa_swparams, SND_PCM_TSTAMP_ENABLE); |
22a8664d | 688 | if (ret < 0) { |
4046c0e7 | 689 | warn("audio_alsa: Can't enable timestamp mode of device: \"%s\": %s.", alsa_out_dev, |
76c5dd92 | 690 | snd_strerror(ret)); |
284cb9d3 | 691 | return ret; |
ae0c9745 | 692 | } |
22a8664d | 693 | |
4046c0e7 MB |
694 | /* write the sw parameters */ |
695 | ret = snd_pcm_sw_params(alsa_handle, alsa_swparams); | |
22a8664d | 696 | if (ret < 0) { |
1d32976d | 697 | warn("audio_alsa: Unable to set software parameters of device: \"%s\": %s.", alsa_out_dev, |
76c5dd92 | 698 | snd_strerror(ret)); |
284cb9d3 | 699 | return ret; |
ae0c9745 | 700 | } |
c8b0be30 | 701 | |
06e9f370 MB |
702 | ret = snd_pcm_prepare(alsa_handle); |
703 | if (ret < 0) { | |
c8b0be30 | 704 | warn("audio_alsa: Unable to prepare the device: \"%s\": %s.", alsa_out_dev, snd_strerror(ret)); |
06e9f370 MB |
705 | return ret; |
706 | } | |
ae0c9745 | 707 | |
4046c0e7 MB |
708 | if (actual_buffer_length < config.audio_backend_buffer_desired_length + minimal_buffer_headroom) { |
709 | /* | |
710 | // the dac buffer is too small, so let's try to set it | |
711 | buffer_size = | |
712 | config.audio_backend_buffer_desired_length + requested_buffer_headroom; | |
713 | ret = snd_pcm_hw_params_set_buffer_size_near(alsa_handle, alsa_params, | |
714 | &buffer_size); | |
715 | if (ret < 0) | |
716 | die("audio_alsa: Unable to set hw buffer size to %lu for device \"%s\": " | |
717 | "%s.", | |
718 | config.audio_backend_buffer_desired_length + | |
719 | requested_buffer_headroom, | |
720 | alsa_out_dev, snd_strerror(ret)); | |
721 | if (config.audio_backend_buffer_desired_length + minimal_buffer_headroom > | |
722 | buffer_size) { | |
723 | die("audio_alsa: Can't set hw buffer size to %lu or more for device " | |
724 | "\"%s\". Requested size: %lu, granted size: %lu.", | |
725 | config.audio_backend_buffer_desired_length + minimal_buffer_headroom, | |
726 | alsa_out_dev, config.audio_backend_buffer_desired_length + | |
727 | requested_buffer_headroom, | |
728 | buffer_size); | |
064bd293 | 729 | } |
4046c0e7 | 730 | */ |
54d761ff MB |
731 | debug(1, |
732 | "The alsa buffer is smaller (%lu bytes) than the desired backend " | |
733 | "buffer " | |
734 | "length (%ld) you have chosen.", | |
4046c0e7 | 735 | actual_buffer_length, config.audio_backend_buffer_desired_length); |
cbc4caa6 | 736 | } |
c8b0be30 MB |
737 | |
738 | if (config.use_precision_timing == YNA_YES) | |
986f2fb4 MB |
739 | delay_and_status = precision_delay_and_status; |
740 | else if (config.use_precision_timing == YNA_AUTO) { | |
1d32976d | 741 | if (precision_delay_available()) { |
986f2fb4 | 742 | delay_and_status = precision_delay_and_status; |
c8b0be30 | 743 | debug(2, "alsa: precision timing selected for \"auto\" mode"); |
986f2fb4 MB |
744 | } |
745 | } | |
cbc4caa6 | 746 | |
4046c0e7 MB |
747 | if (alsa_characteristics_already_listed == 0) { |
748 | alsa_characteristics_already_listed = 1; | |
749 | int log_level = 2; // the level at which debug information should be output | |
750 | // int rc; | |
751 | snd_pcm_access_t access_type; | |
752 | snd_pcm_format_t format_type; | |
753 | snd_pcm_subformat_t subformat_type; | |
754 | // unsigned int val, val2; | |
755 | unsigned int uval, uval2; | |
756 | int sval; | |
757 | int dir; | |
758 | snd_pcm_uframes_t frames; | |
759 | ||
760 | debug(log_level, "PCM handle name = '%s'", snd_pcm_name(alsa_handle)); | |
761 | ||
60487c86 MB |
762 | // ret = snd_pcm_hw_params_any(alsa_handle, alsa_params); |
763 | // if (ret < 0) { | |
764 | // die("audio_alsa: Cannpot get configuration for | |
555bb97a MB |
765 | // device |
766 | //\"%s\": | |
767 | // no | |
4046c0e7 MB |
768 | // configurations |
769 | //" | |
60487c86 MB |
770 | // "available", |
771 | // alsa_out_dev); | |
772 | // } | |
4046c0e7 MB |
773 | |
774 | debug(log_level, "alsa device parameters:"); | |
775 | ||
776 | snd_pcm_hw_params_get_access(alsa_params, &access_type); | |
777 | debug(log_level, " access type = %s", snd_pcm_access_name(access_type)); | |
778 | ||
779 | snd_pcm_hw_params_get_format(alsa_params, &format_type); | |
780 | debug(log_level, " format = '%s' (%s)", snd_pcm_format_name(format_type), | |
781 | snd_pcm_format_description(format_type)); | |
782 | ||
783 | snd_pcm_hw_params_get_subformat(alsa_params, &subformat_type); | |
784 | debug(log_level, " subformat = '%s' (%s)", snd_pcm_subformat_name(subformat_type), | |
785 | snd_pcm_subformat_description(subformat_type)); | |
786 | ||
787 | snd_pcm_hw_params_get_channels(alsa_params, &uval); | |
788 | debug(log_level, " number of channels = %u", uval); | |
789 | ||
790 | sval = snd_pcm_hw_params_get_sbits(alsa_params); | |
791 | debug(log_level, " number of significant bits = %d", sval); | |
792 | ||
793 | snd_pcm_hw_params_get_rate(alsa_params, &uval, &dir); | |
794 | switch (dir) { | |
795 | case -1: | |
796 | debug(log_level, " rate = %u frames per second (<).", uval); | |
797 | break; | |
798 | case 0: | |
799 | debug(log_level, " rate = %u frames per second (precisely).", uval); | |
800 | break; | |
801 | case 1: | |
802 | debug(log_level, " rate = %u frames per second (>).", uval); | |
803 | break; | |
064bd293 | 804 | } |
ae0c9745 | 805 | |
c0a3dacf MB |
806 | if ((snd_pcm_hw_params_get_rate_numden(alsa_params, &uval, &uval2) == 0) && (uval2 != 0)) |
807 | // watch for a divide by zero too! | |
4046c0e7 | 808 | debug(log_level, " precise (rational) rate = %.3f frames per second (i.e. %u/%u).", uval, |
14bfba27 MB |
809 | uval2, ((double)uval) / uval2); |
810 | else | |
4046c0e7 MB |
811 | debug(log_level, " precise (rational) rate information unavailable."); |
812 | ||
813 | snd_pcm_hw_params_get_period_time(alsa_params, &uval, &dir); | |
814 | switch (dir) { | |
815 | case -1: | |
816 | debug(log_level, " period_time = %u us (<).", uval); | |
817 | break; | |
818 | case 0: | |
819 | debug(log_level, " period_time = %u us (precisely).", uval); | |
820 | break; | |
821 | case 1: | |
822 | debug(log_level, " period_time = %u us (>).", uval); | |
823 | break; | |
824 | } | |
825 | ||
826 | snd_pcm_hw_params_get_period_size(alsa_params, &frames, &dir); | |
827 | switch (dir) { | |
828 | case -1: | |
829 | debug(log_level, " period_size = %lu frames (<).", frames); | |
830 | break; | |
831 | case 0: | |
832 | debug(log_level, " period_size = %lu frames (precisely).", frames); | |
833 | break; | |
834 | case 1: | |
835 | debug(log_level, " period_size = %lu frames (>).", frames); | |
836 | break; | |
837 | } | |
838 | ||
839 | snd_pcm_hw_params_get_buffer_time(alsa_params, &uval, &dir); | |
840 | switch (dir) { | |
841 | case -1: | |
842 | debug(log_level, " buffer_time = %u us (<).", uval); | |
843 | break; | |
844 | case 0: | |
845 | debug(log_level, " buffer_time = %u us (precisely).", uval); | |
846 | break; | |
847 | case 1: | |
848 | debug(log_level, " buffer_time = %u us (>).", uval); | |
849 | break; | |
850 | } | |
851 | ||
852 | snd_pcm_hw_params_get_buffer_size(alsa_params, &frames); | |
853 | switch (dir) { | |
854 | case -1: | |
855 | debug(log_level, " buffer_size = %lu frames (<).", frames); | |
856 | break; | |
857 | case 0: | |
858 | debug(log_level, " buffer_size = %lu frames (precisely).", frames); | |
859 | break; | |
860 | case 1: | |
861 | debug(log_level, " buffer_size = %lu frames (>).", frames); | |
862 | break; | |
863 | } | |
864 | ||
865 | snd_pcm_hw_params_get_periods(alsa_params, &uval, &dir); | |
866 | switch (dir) { | |
867 | case -1: | |
868 | debug(log_level, " periods_per_buffer = %u (<).", uval); | |
869 | break; | |
870 | case 0: | |
871 | debug(log_level, " periods_per_buffer = %u (precisely).", uval); | |
872 | break; | |
873 | case 1: | |
874 | debug(log_level, " periods_per_buffer = %u (>).", uval); | |
875 | break; | |
064bd293 | 876 | } |
2c40f23f | 877 | } |
4046c0e7 MB |
878 | return 0; |
879 | } | |
880 | ||
fd880056 | 881 | static int open_alsa_device(int do_auto_setup) { |
4046c0e7 MB |
882 | int result; |
883 | int oldState; | |
884 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable | |
83c0405d | 885 | result = actual_open_alsa_device(do_auto_setup); |
4046c0e7 MB |
886 | pthread_setcancelstate(oldState, NULL); |
887 | return result; | |
888 | } | |
ae0c9745 | 889 | |
fd880056 | 890 | static int prepare_mixer() { |
c5ff0dfe | 891 | int response = 0; |
e8a92d3c | 892 | // do any alsa device initialisation (general case) |
c5ff0dfe | 893 | // at present, this is only needed if a hardware mixer is being used |
e8a92d3c | 894 | // if there's a hardware mixer, it needs to be initialised before use |
54d761ff MB |
895 | if (alsa_mix_ctrl == NULL) { |
896 | audio_alsa.volume = NULL; | |
897 | audio_alsa.parameters = NULL; | |
898 | audio_alsa.mute = NULL; | |
899 | } else { | |
900 | debug(2, "alsa: hardware mixer prepare"); | |
901 | int oldState; | |
902 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable | |
903 | ||
904 | if (alsa_mix_dev == NULL) | |
905 | alsa_mix_dev = alsa_out_dev; | |
906 | ||
907 | // Now, start trying to initialise the alsa device with the settings | |
908 | // obtained | |
909 | pthread_cleanup_debug_mutex_lock(&alsa_mixer_mutex, 1000, 1); | |
76387f82 | 910 | if (open_mixer() == 0) { |
54d761ff | 911 | if (snd_mixer_selem_get_playback_volume_range(alsa_mix_elem, &alsa_mix_minv, &alsa_mix_maxv) < |
76387f82 | 912 | 0) { |
54d761ff | 913 | debug(1, "Can't read mixer's [linear] min and max volumes."); |
76387f82 | 914 | } else { |
54d761ff MB |
915 | if (snd_mixer_selem_get_playback_dB_range(alsa_mix_elem, &alsa_mix_mindb, |
916 | &alsa_mix_maxdb) == 0) { | |
917 | ||
918 | audio_alsa.volume = &volume; // insert the volume function now we | |
919 | // know it can do dB stuff | |
920 | audio_alsa.parameters = ¶meters; // likewise the parameters stuff | |
921 | if (alsa_mix_mindb == SND_CTL_TLV_DB_GAIN_MUTE) { | |
922 | // For instance, the Raspberry Pi does this | |
00bc837b | 923 | debug(2, "Lowest dB value is a mute"); |
54d761ff MB |
924 | mixer_volume_setting_gives_mute = 1; |
925 | alsa_mix_mute = SND_CTL_TLV_DB_GAIN_MUTE; // this may not be | |
926 | // necessary -- it's | |
927 | // always | |
928 | // going to be SND_CTL_TLV_DB_GAIN_MUTE, right? | |
929 | // debug(1, "Try minimum volume + 1 as lowest true attenuation | |
930 | // value"); | |
931 | if (snd_mixer_selem_ask_playback_vol_dB(alsa_mix_elem, alsa_mix_minv + 1, | |
932 | &alsa_mix_mindb) != 0) | |
933 | debug(1, "Can't get dB value corresponding to a minimum volume " | |
934 | "+ 1."); | |
935 | } | |
936 | debug(3, "Hardware mixer has dB volume from %f to %f.", (1.0 * alsa_mix_mindb) / 100.0, | |
937 | (1.0 * alsa_mix_maxdb) / 100.0); | |
938 | } else { | |
939 | // use the linear scale and do the db conversion ourselves | |
940 | warn("The hardware mixer specified -- \"%s\" -- does not have " | |
941 | "a dB volume scale.", | |
942 | alsa_mix_ctrl); | |
943 | ||
76387f82 | 944 | if ((response = snd_ctl_open(&ctl, alsa_mix_dev, 0)) < 0) { |
54d761ff | 945 | warn("Cannot open control \"%s\"", alsa_mix_dev); |
54d761ff | 946 | } |
76387f82 | 947 | if ((response = snd_ctl_elem_id_malloc(&elem_id)) < 0) { |
54d761ff MB |
948 | debug(1, "Cannot allocate memory for control \"%s\"", alsa_mix_dev); |
949 | elem_id = NULL; | |
c5ff0dfe | 950 | } else { |
54d761ff MB |
951 | snd_ctl_elem_id_set_interface(elem_id, SND_CTL_ELEM_IFACE_MIXER); |
952 | snd_ctl_elem_id_set_name(elem_id, alsa_mix_ctrl); | |
953 | ||
954 | if (snd_ctl_get_dB_range(ctl, elem_id, &alsa_mix_mindb, &alsa_mix_maxdb) == 0) { | |
955 | debug(1, | |
956 | "alsa: hardware mixer \"%s\" selected, with dB volume " | |
957 | "from %f to %f.", | |
958 | alsa_mix_ctrl, (1.0 * alsa_mix_mindb) / 100.0, (1.0 * alsa_mix_maxdb) / 100.0); | |
959 | has_softvol = 1; | |
960 | audio_alsa.volume = &volume; // insert the volume function now | |
961 | // we know it can do dB stuff | |
962 | audio_alsa.parameters = ¶meters; // likewise the parameters stuff | |
c5ff0dfe | 963 | } else { |
54d761ff | 964 | debug(1, "Cannot get the dB range from the volume control \"%s\"", alsa_mix_ctrl); |
c5ff0dfe MB |
965 | } |
966 | } | |
c5ff0dfe MB |
967 | } |
968 | } | |
54d761ff MB |
969 | if (((config.alsa_use_hardware_mute == 1) && |
970 | (snd_mixer_selem_has_playback_switch(alsa_mix_elem))) || | |
971 | mixer_volume_setting_gives_mute) { | |
972 | audio_alsa.mute = &mute; // insert the mute function now we know it | |
973 | // can do muting stuff | |
974 | // debug(1, "Has mixer and mute ability we will use."); | |
975 | } else { | |
976 | // debug(1, "Has mixer but not using hardware mute."); | |
977 | } | |
76387f82 MB |
978 | if (response == 0) |
979 | response = close_mixer(); | |
555bb97a | 980 | } |
54d761ff MB |
981 | debug_mutex_unlock(&alsa_mixer_mutex, 3); // release the mutex |
982 | pthread_cleanup_pop(0); | |
983 | pthread_setcancelstate(oldState, NULL); | |
984 | } | |
c5ff0dfe MB |
985 | return response; |
986 | } | |
987 | ||
fd880056 | 988 | static int alsa_device_init() { return prepare_mixer(); } |
e8a92d3c | 989 | |
4046c0e7 MB |
990 | static int init(int argc, char **argv) { |
991 | // for debugging | |
992 | snd_output_stdio_attach(&output, stdout, 0); | |
754155ce | 993 | |
4046c0e7 MB |
994 | // debug(2,"audio_alsa init called."); |
995 | int response = 0; // this will be what we return to the caller. | |
c5ff0dfe | 996 | alsa_device_initialised = 0; |
4046c0e7 MB |
997 | const char *str; |
998 | int value; | |
999 | // double dvalue; | |
754155ce | 1000 | |
4046c0e7 | 1001 | // set up default values first |
bd81e733 MB |
1002 | |
1003 | alsa_backend_state = abm_disconnected; // startup state | |
56bf8862 | 1004 | debug(2, "alsa: init() -- alsa_backend_state => abm_disconnected."); |
4046c0e7 MB |
1005 | set_period_size_request = 0; |
1006 | set_buffer_size_request = 0; | |
1007 | config.alsa_use_hardware_mute = 0; // don't use it by default | |
ab1f55fe | 1008 | |
4046c0e7 | 1009 | config.audio_backend_latency_offset = 0; |
c958d506 | 1010 | config.audio_backend_buffer_desired_length = 0.200; |
80f15e1f | 1011 | config.audio_backend_buffer_interpolation_threshold_in_seconds = |
c958d506 | 1012 | 0.120; // below this, basic interpolation will be used to save time. |
4046c0e7 | 1013 | config.alsa_maximum_stall_time = 0.200; // 200 milliseconds -- if it takes longer, it's a problem |
a8faacd3 | 1014 | config.disable_standby_mode_silence_threshold = |
2e442853 | 1015 | 0.040; // start sending silent frames if the delay goes below this time |
a8faacd3 | 1016 | config.disable_standby_mode_silence_scan_interval = 0.004; // check silence threshold this often |
4613ee6b | 1017 | |
48043a81 MB |
1018 | stall_monitor_error_threshold = |
1019 | (uint64_t)1000000 * config.alsa_maximum_stall_time; // stall time max to microseconds; | |
1020 | stall_monitor_error_threshold = (stall_monitor_error_threshold << 32) / 1000000; // now in fp form | |
a8faacd3 | 1021 | debug(1, "alsa: alsa_maximum_stall_time of %f sec.", config.alsa_maximum_stall_time); |
48043a81 MB |
1022 | |
1023 | stall_monitor_start_time = 0; | |
1024 | stall_monitor_frame_count = 0; | |
c8b0be30 | 1025 | |
aac57c9c MB |
1026 | config.disable_standby_mode = disable_standby_off; |
1027 | config.keep_dac_busy = 0; | |
1028 | config.use_precision_timing = YNA_AUTO; | |
ae0c9745 | 1029 | |
4046c0e7 MB |
1030 | // get settings from settings file first, allow them to be overridden by |
1031 | // command line options | |
ae0c9745 | 1032 | |
555bb97a MB |
1033 | // do the "general" audio options. Note, these options are in the "general" |
1034 | // stanza! | |
4046c0e7 | 1035 | parse_general_audio_options(); |
e7f70fba | 1036 | |
4046c0e7 MB |
1037 | if (config.cfg != NULL) { |
1038 | double dvalue; | |
ae0c9745 | 1039 | |
4046c0e7 MB |
1040 | /* Get the Output Device Name. */ |
1041 | if (config_lookup_string(config.cfg, "alsa.output_device", &str)) { | |
1042 | alsa_out_dev = (char *)str; | |
1043 | } | |
e7f70fba | 1044 | |
4046c0e7 | 1045 | /* Get the Mixer Type setting. */ |
e7f70fba | 1046 | |
4046c0e7 MB |
1047 | if (config_lookup_string(config.cfg, "alsa.mixer_type", &str)) { |
1048 | inform("The alsa mixer_type setting is deprecated and has been ignored. " | |
1049 | "FYI, using the \"mixer_control_name\" setting automatically " | |
1050 | "chooses a hardware mixer."); | |
d5881f63 | 1051 | } |
e7f70fba | 1052 | |
4046c0e7 MB |
1053 | /* Get the Mixer Device Name. */ |
1054 | if (config_lookup_string(config.cfg, "alsa.mixer_device", &str)) { | |
1055 | alsa_mix_dev = (char *)str; | |
1056 | } | |
064bd293 | 1057 | |
4046c0e7 MB |
1058 | /* Get the Mixer Control Name. */ |
1059 | if (config_lookup_string(config.cfg, "alsa.mixer_control_name", &str)) { | |
1060 | alsa_mix_ctrl = (char *)str; | |
4046c0e7 | 1061 | } |
064bd293 | 1062 | |
6ced6bc6 MB |
1063 | // Get the Mixer Control Index |
1064 | if (config_lookup_int(config.cfg, "alsa.mixer_control_index", &value)) { | |
1065 | alsa_mix_index = value; | |
1066 | } | |
1067 | ||
4046c0e7 MB |
1068 | /* Get the disable_synchronization setting. */ |
1069 | if (config_lookup_string(config.cfg, "alsa.disable_synchronization", &str)) { | |
1070 | if (strcasecmp(str, "no") == 0) | |
1071 | config.no_sync = 0; | |
1072 | else if (strcasecmp(str, "yes") == 0) | |
1073 | config.no_sync = 1; | |
1074 | else { | |
555bb97a MB |
1075 | warn("Invalid disable_synchronization option choice \"%s\". It should " |
1076 | "be \"yes\" or " | |
4046c0e7 MB |
1077 | "\"no\". It is set to \"no\"."); |
1078 | config.no_sync = 0; | |
1079 | } | |
1080 | } | |
064bd293 | 1081 | |
4046c0e7 MB |
1082 | /* Get the mute_using_playback_switch setting. */ |
1083 | if (config_lookup_string(config.cfg, "alsa.mute_using_playback_switch", &str)) { | |
1084 | inform("The alsa \"mute_using_playback_switch\" setting is deprecated. " | |
1085 | "Please use the \"use_hardware_mute_if_available\" setting instead."); | |
1086 | if (strcasecmp(str, "no") == 0) | |
1087 | config.alsa_use_hardware_mute = 0; | |
1088 | else if (strcasecmp(str, "yes") == 0) | |
1089 | config.alsa_use_hardware_mute = 1; | |
1090 | else { | |
555bb97a MB |
1091 | warn("Invalid mute_using_playback_switch option choice \"%s\". It " |
1092 | "should be \"yes\" or " | |
4046c0e7 MB |
1093 | "\"no\". It is set to \"no\"."); |
1094 | config.alsa_use_hardware_mute = 0; | |
1095 | } | |
1096 | } | |
064bd293 | 1097 | |
4046c0e7 MB |
1098 | /* Get the use_hardware_mute_if_available setting. */ |
1099 | if (config_lookup_string(config.cfg, "alsa.use_hardware_mute_if_available", &str)) { | |
1100 | if (strcasecmp(str, "no") == 0) | |
1101 | config.alsa_use_hardware_mute = 0; | |
1102 | else if (strcasecmp(str, "yes") == 0) | |
1103 | config.alsa_use_hardware_mute = 1; | |
1104 | else { | |
555bb97a MB |
1105 | warn("Invalid use_hardware_mute_if_available option choice \"%s\". It " |
1106 | "should be \"yes\" or " | |
4046c0e7 MB |
1107 | "\"no\". It is set to \"no\"."); |
1108 | config.alsa_use_hardware_mute = 0; | |
1109 | } | |
1110 | } | |
064bd293 | 1111 | |
4046c0e7 MB |
1112 | /* Get the output format, using the same names as aplay does*/ |
1113 | if (config_lookup_string(config.cfg, "alsa.output_format", &str)) { | |
c8b0be30 MB |
1114 | int temp_output_format_auto_requested = config.output_format_auto_requested; |
1115 | config.output_format_auto_requested = 0; // assume a valid format will be given. | |
4046c0e7 MB |
1116 | if (strcasecmp(str, "S16") == 0) |
1117 | config.output_format = SPS_FORMAT_S16; | |
1d32976d MB |
1118 | else if (strcasecmp(str, "S16_LE") == 0) |
1119 | config.output_format = SPS_FORMAT_S16_LE; | |
1120 | else if (strcasecmp(str, "S16_BE") == 0) | |
1121 | config.output_format = SPS_FORMAT_S16_BE; | |
4046c0e7 MB |
1122 | else if (strcasecmp(str, "S24") == 0) |
1123 | config.output_format = SPS_FORMAT_S24; | |
1d32976d MB |
1124 | else if (strcasecmp(str, "S24_LE") == 0) |
1125 | config.output_format = SPS_FORMAT_S24_LE; | |
1126 | else if (strcasecmp(str, "S24_BE") == 0) | |
1127 | config.output_format = SPS_FORMAT_S24_BE; | |
4046c0e7 MB |
1128 | else if (strcasecmp(str, "S24_3LE") == 0) |
1129 | config.output_format = SPS_FORMAT_S24_3LE; | |
1130 | else if (strcasecmp(str, "S24_3BE") == 0) | |
1131 | config.output_format = SPS_FORMAT_S24_3BE; | |
1132 | else if (strcasecmp(str, "S32") == 0) | |
1133 | config.output_format = SPS_FORMAT_S32; | |
1d32976d MB |
1134 | else if (strcasecmp(str, "S32_LE") == 0) |
1135 | config.output_format = SPS_FORMAT_S32_LE; | |
1136 | else if (strcasecmp(str, "S32_BE") == 0) | |
1137 | config.output_format = SPS_FORMAT_S32_BE; | |
4046c0e7 MB |
1138 | else if (strcasecmp(str, "U8") == 0) |
1139 | config.output_format = SPS_FORMAT_U8; | |
1140 | else if (strcasecmp(str, "S8") == 0) | |
1141 | config.output_format = SPS_FORMAT_S8; | |
83c0405d MB |
1142 | else if (strcasecmp(str, "auto") == 0) |
1143 | config.output_format_auto_requested = 1; | |
4046c0e7 | 1144 | else { |
c8b0be30 MB |
1145 | config.output_format_auto_requested = |
1146 | temp_output_format_auto_requested; // format was invalid; recall the original setting | |
76ad4e6a | 1147 | warn("Invalid output format \"%s\". It should be \"auto\", \"U8\", \"S8\", " |
1d32976d | 1148 | "\"S16\", \"S24\", \"S24_LE\", \"S24_BE\", " |
4046c0e7 | 1149 | "\"S24_3LE\", \"S24_3BE\" or " |
c8b0be30 | 1150 | "\"S32\", \"S32_LE\", \"S32_BE\". It remains set to \"%s\".", |
54d761ff MB |
1151 | str, |
1152 | config.output_format_auto_requested == 1 | |
1153 | ? "auto" | |
1154 | : sps_format_description_string(config.output_format)); | |
4046c0e7 MB |
1155 | } |
1156 | } | |
064bd293 | 1157 | |
83c0405d | 1158 | if (config_lookup_string(config.cfg, "alsa.output_rate", &str)) { |
c8b0be30 MB |
1159 | if (strcasecmp(str, "auto") == 0) { |
1160 | config.output_rate_auto_requested = 1; | |
1161 | } else { | |
1162 | if (config.output_rate_auto_requested == 1) | |
1163 | warn("Invalid output rate \"%s\". It should be \"auto\", 44100, 88200, 176400 or 352800. " | |
1164 | "It remains set to \"auto\". Note: numbers should not be placed in quotes.", | |
1165 | str); | |
1166 | else | |
1167 | warn("Invalid output rate \"%s\". It should be \"auto\", 44100, 88200, 176400 or 352800. " | |
1168 | "It remains set to %d. Note: numbers should not be placed in quotes.", | |
1169 | str, config.output_rate); | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | /* Get the output rate, which must be a multiple of 44,100*/ | |
1174 | if (config_lookup_int(config.cfg, "alsa.output_rate", &value)) { | |
1175 | debug(1, "alsa output rate is %d frames per second", value); | |
1176 | switch (value) { | |
1177 | case 44100: | |
1178 | case 88200: | |
1179 | case 176400: | |
1180 | case 352800: | |
1181 | config.output_rate = value; | |
1182 | config.output_rate_auto_requested = 0; | |
1183 | break; | |
1184 | default: | |
1185 | if (config.output_rate_auto_requested == 1) | |
1186 | warn("Invalid output rate \"%d\". It should be \"auto\", 44100, 88200, 176400 or 352800. " | |
1187 | "It remains set to \"auto\".", | |
1188 | value); | |
1189 | else | |
1190 | warn("Invalid output rate \"%d\".It should be \"auto\", 44100, 88200, 176400 or 352800. " | |
1191 | "It remains set to %d.", | |
1192 | value, config.output_rate); | |
1193 | } | |
1194 | } | |
064bd293 | 1195 | |
4046c0e7 MB |
1196 | /* Get the use_mmap_if_available setting. */ |
1197 | if (config_lookup_string(config.cfg, "alsa.use_mmap_if_available", &str)) { | |
1198 | if (strcasecmp(str, "no") == 0) | |
1199 | config.no_mmap = 1; | |
1200 | else if (strcasecmp(str, "yes") == 0) | |
1201 | config.no_mmap = 0; | |
1202 | else { | |
555bb97a MB |
1203 | warn("Invalid use_mmap_if_available option choice \"%s\". It should be " |
1204 | "\"yes\" or \"no\". " | |
76ad4e6a | 1205 | "It remains set to \"yes\"."); |
4046c0e7 MB |
1206 | config.no_mmap = 0; |
1207 | } | |
1208 | } | |
1209 | /* Get the optional period size value */ | |
1210 | if (config_lookup_int(config.cfg, "alsa.period_size", &value)) { | |
1211 | set_period_size_request = 1; | |
1212 | debug(1, "Value read for period size is %d.", value); | |
1213 | if (value < 0) { | |
1214 | warn("Invalid alsa period size setting \"%d\". It " | |
1215 | "must be greater than 0. No setting is made.", | |
1216 | value); | |
1217 | set_period_size_request = 0; | |
1218 | } else { | |
1219 | period_size_requested = value; | |
1220 | } | |
1221 | } | |
064bd293 | 1222 | |
4046c0e7 MB |
1223 | /* Get the optional buffer size value */ |
1224 | if (config_lookup_int(config.cfg, "alsa.buffer_size", &value)) { | |
1225 | set_buffer_size_request = 1; | |
1226 | debug(1, "Value read for buffer size is %d.", value); | |
1227 | if (value < 0) { | |
1228 | warn("Invalid alsa buffer size setting \"%d\". It " | |
1229 | "must be greater than 0. No setting is made.", | |
1230 | value); | |
1231 | set_buffer_size_request = 0; | |
1232 | } else { | |
1233 | buffer_size_requested = value; | |
1234 | } | |
1235 | } | |
064bd293 | 1236 | |
4046c0e7 MB |
1237 | /* Get the optional alsa_maximum_stall_time setting. */ |
1238 | if (config_lookup_float(config.cfg, "alsa.maximum_stall_time", &dvalue)) { | |
1239 | if (dvalue < 0.0) { | |
1240 | warn("Invalid alsa maximum write time setting \"%f\". It " | |
1241 | "must be greater than 0. Default is \"%f\". No setting is made.", | |
1242 | dvalue, config.alsa_maximum_stall_time); | |
1243 | } else { | |
1244 | config.alsa_maximum_stall_time = dvalue; | |
1245 | } | |
064bd293 MB |
1246 | } |
1247 | ||
a8faacd3 MB |
1248 | /* Get the optional disable_standby_mode_silence_threshold setting. */ |
1249 | if (config_lookup_float(config.cfg, "alsa.disable_standby_mode_silence_threshold", &dvalue)) { | |
1250 | if (dvalue < 0.0) { | |
1251 | warn("Invalid alsa disable_standby_mode_silence_threshold setting \"%f\". It " | |
1252 | "must be greater than 0. Default is \"%f\". No setting is made.", | |
1253 | dvalue, config.disable_standby_mode_silence_threshold); | |
1254 | } else { | |
1255 | config.disable_standby_mode_silence_threshold = dvalue; | |
1256 | } | |
1257 | } | |
1258 | ||
1259 | /* Get the optional disable_standby_mode_silence_scan_interval setting. */ | |
1260 | if (config_lookup_float(config.cfg, "alsa.disable_standby_mode_silence_scan_interval", | |
1261 | &dvalue)) { | |
1262 | if (dvalue < 0.0) { | |
1263 | warn("Invalid alsa disable_standby_mode_silence_scan_interval setting \"%f\". It " | |
1264 | "must be greater than 0. Default is \"%f\". No setting is made.", | |
1265 | dvalue, config.disable_standby_mode_silence_scan_interval); | |
1266 | } else { | |
1267 | config.disable_standby_mode_silence_scan_interval = dvalue; | |
1268 | } | |
1269 | } | |
1270 | ||
c86823c3 | 1271 | /* Get the optional disable_standby_mode setting. */ |
c86823c3 | 1272 | if (config_lookup_string(config.cfg, "alsa.disable_standby_mode", &str)) { |
c8b0be30 MB |
1273 | if ((strcasecmp(str, "no") == 0) || (strcasecmp(str, "off") == 0) || |
1274 | (strcasecmp(str, "never") == 0)) | |
c86823c3 | 1275 | config.disable_standby_mode = disable_standby_off; |
c8b0be30 MB |
1276 | else if ((strcasecmp(str, "yes") == 0) || (strcasecmp(str, "on") == 0) || |
1277 | (strcasecmp(str, "always") == 0)) { | |
8b589879 | 1278 | config.disable_standby_mode = disable_standby_always; |
c86823c3 | 1279 | config.keep_dac_busy = 1; |
83c0405d MB |
1280 | } else if (strcasecmp(str, "auto") == 0) |
1281 | config.disable_standby_mode = disable_standby_auto; | |
c86823c3 MB |
1282 | else { |
1283 | warn("Invalid disable_standby_mode option choice \"%s\". It should be " | |
83c0405d | 1284 | "\"always\", \"auto\" or \"never\". " |
c8b0be30 MB |
1285 | "It remains set to \"never\".", |
1286 | str); | |
c86823c3 | 1287 | } |
4ba0947d | 1288 | } |
c86823c3 | 1289 | |
aac57c9c | 1290 | if (config_lookup_string(config.cfg, "alsa.use_precision_timing", &str)) { |
c8b0be30 MB |
1291 | if ((strcasecmp(str, "no") == 0) || (strcasecmp(str, "off") == 0) || |
1292 | (strcasecmp(str, "never") == 0)) | |
aac57c9c | 1293 | config.use_precision_timing = YNA_NO; |
c8b0be30 MB |
1294 | else if ((strcasecmp(str, "yes") == 0) || (strcasecmp(str, "on") == 0) || |
1295 | (strcasecmp(str, "always") == 0)) { | |
aac57c9c MB |
1296 | config.use_precision_timing = YNA_YES; |
1297 | config.keep_dac_busy = 1; | |
1298 | } else if (strcasecmp(str, "auto") == 0) | |
1299 | config.use_precision_timing = YNA_AUTO; | |
1300 | else { | |
1301 | warn("Invalid use_precision_timing option choice \"%s\". It should be " | |
1302 | "\"yes\", \"auto\" or \"no\". " | |
c8b0be30 | 1303 | "It remains set to \"%s\".", |
c0a3dacf MB |
1304 | config.use_precision_timing == YNA_NO ? "no" |
1305 | : config.use_precision_timing == YNA_AUTO ? "auto" | |
1306 | : "yes"); | |
aac57c9c MB |
1307 | } |
1308 | } | |
1309 | ||
c8b0be30 | 1310 | debug(1, "alsa: disable_standby_mode is \"%s\".", |
c0a3dacf MB |
1311 | config.disable_standby_mode == disable_standby_off ? "never" |
1312 | : config.disable_standby_mode == disable_standby_always ? "always" | |
1313 | : "auto"); | |
a8faacd3 MB |
1314 | debug(1, "alsa: disable_standby_mode_silence_threshold is %f seconds.", |
1315 | config.disable_standby_mode_silence_threshold); | |
1316 | debug(1, "alsa: disable_standby_mode_silence_scan_interval is %f seconds.", | |
1317 | config.disable_standby_mode_silence_scan_interval); | |
4046c0e7 | 1318 | } |
064bd293 | 1319 | |
4046c0e7 MB |
1320 | optind = 1; // optind=0 is equivalent to optind=1 plus special behaviour |
1321 | argv--; // so we shift the arguments to satisfy getopt() | |
1322 | argc++; | |
1323 | // some platforms apparently require optreset = 1; - which? | |
1324 | int opt; | |
1325 | while ((opt = getopt(argc, argv, "d:t:m:c:i:")) > 0) { | |
1326 | switch (opt) { | |
1327 | case 'd': | |
1328 | alsa_out_dev = optarg; | |
064bd293 | 1329 | break; |
064bd293 | 1330 | |
4046c0e7 MB |
1331 | case 't': |
1332 | inform("The alsa backend -t option is deprecated and has been ignored. " | |
1333 | "FYI, using the -c option automatically chooses a hardware " | |
1334 | "mixer."); | |
064bd293 | 1335 | break; |
064bd293 | 1336 | |
4046c0e7 MB |
1337 | case 'm': |
1338 | alsa_mix_dev = optarg; | |
064bd293 | 1339 | break; |
4046c0e7 MB |
1340 | case 'c': |
1341 | alsa_mix_ctrl = optarg; | |
064bd293 | 1342 | break; |
4046c0e7 MB |
1343 | case 'i': |
1344 | alsa_mix_index = strtol(optarg, NULL, 10); | |
064bd293 | 1345 | break; |
4046c0e7 MB |
1346 | default: |
1347 | warn("Invalid audio option \"-%c\" specified -- ignored.", opt); | |
1348 | help(); | |
064bd293 | 1349 | } |
4046c0e7 | 1350 | } |
064bd293 | 1351 | |
4046c0e7 MB |
1352 | if (optind < argc) { |
1353 | warn("Invalid audio argument: \"%s\" -- ignored", argv[optind]); | |
1354 | } | |
064bd293 | 1355 | |
4046c0e7 | 1356 | debug(1, "alsa: output device name is \"%s\".", alsa_out_dev); |
555bb97a | 1357 | |
555bb97a MB |
1358 | // so, now, if the option to keep the DAC running has been selected, start a |
1359 | // thread to monitor the | |
4046c0e7 MB |
1360 | // length of the queue |
1361 | // if the queue gets too short, stuff it with silence | |
1362 | ||
4ba0947d | 1363 | pthread_create(&alsa_buffer_monitor_thread, NULL, &alsa_buffer_monitor_thread_code, NULL); |
4046c0e7 MB |
1364 | |
1365 | return response; | |
83504880 MB |
1366 | } |
1367 | ||
4046c0e7 | 1368 | static void deinit(void) { |
3b4654df MB |
1369 | int oldState; |
1370 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable | |
4046c0e7 MB |
1371 | // debug(2,"audio_alsa deinit called."); |
1372 | stop(); | |
405a028f | 1373 | debug(2, "Cancel buffer monitor thread."); |
ad6c721d | 1374 | pthread_cancel(alsa_buffer_monitor_thread); |
405a028f | 1375 | debug(3, "Join buffer monitor thread."); |
ad6c721d | 1376 | pthread_join(alsa_buffer_monitor_thread, NULL); |
3b4654df | 1377 | pthread_setcancelstate(oldState, NULL); |
3b4654df MB |
1378 | } |
1379 | ||
fd880056 | 1380 | static int set_mute_state() { |
60487c86 | 1381 | int response = 1; // some problem expected, e.g. no mixer or not allowed to use it or disconnected |
bfc7b9b7 MB |
1382 | int oldState; |
1383 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable | |
0c552148 | 1384 | pthread_cleanup_debug_mutex_lock(&alsa_mixer_mutex, 10000, 0); |
2c0250b3 | 1385 | if ((alsa_backend_state != abm_disconnected) && (config.alsa_use_hardware_mute == 1) && |
76387f82 | 1386 | (open_mixer() == 0)) { |
60487c86 | 1387 | response = 0; // okay if actually using the mute facility |
bfc7b9b7 | 1388 | debug(2, "alsa: actually set_mute_state"); |
555bb97a MB |
1389 | int mute = 0; |
1390 | if ((mute_requested_externally != 0) || (mute_requested_internally != 0)) | |
2c0250b3 | 1391 | mute = 1; |
60487c86 | 1392 | if (mute == 1) { |
bfc7b9b7 | 1393 | debug(2, "alsa: hardware mute switched on"); |
60487c86 MB |
1394 | if (snd_mixer_selem_has_playback_switch(alsa_mix_elem)) |
1395 | snd_mixer_selem_set_playback_switch_all(alsa_mix_elem, 0); | |
1396 | else { | |
1397 | volume_based_mute_is_active = 1; | |
1398 | do_snd_mixer_selem_set_playback_dB_all(alsa_mix_elem, alsa_mix_mute); | |
1399 | } | |
1400 | } else { | |
bfc7b9b7 | 1401 | debug(2, "alsa: hardware mute switched off"); |
60487c86 MB |
1402 | if (snd_mixer_selem_has_playback_switch(alsa_mix_elem)) |
1403 | snd_mixer_selem_set_playback_switch_all(alsa_mix_elem, 1); | |
1404 | else { | |
1405 | volume_based_mute_is_active = 0; | |
1406 | do_snd_mixer_selem_set_playback_dB_all(alsa_mix_elem, set_volume); | |
555bb97a | 1407 | } |
555bb97a | 1408 | } |
60487c86 | 1409 | close_mixer(); |
555bb97a | 1410 | } |
0c552148 | 1411 | debug_mutex_unlock(&alsa_mixer_mutex, 3); // release the mutex |
c8b0be30 | 1412 | pthread_cleanup_pop(0); // release the mutex |
bfc7b9b7 | 1413 | pthread_setcancelstate(oldState, NULL); |
555bb97a MB |
1414 | return response; |
1415 | } | |
60487c86 | 1416 | |
c8b0be30 MB |
1417 | static void start(__attribute__((unused)) int i_sample_rate, |
1418 | __attribute__((unused)) int i_sample_format) { | |
60487c86 | 1419 | debug(3, "audio_alsa start called."); |
c8b0be30 | 1420 | |
99c66385 MB |
1421 | // frame_index = 0; |
1422 | // measurement_data_is_valid = 0; | |
9d5ff22f | 1423 | |
46a13dce MB |
1424 | stall_monitor_start_time = 0; |
1425 | stall_monitor_frame_count = 0; | |
c5ff0dfe | 1426 | if (alsa_device_initialised == 0) { |
e8a92d3c MB |
1427 | debug(1, "alsa: start() calling alsa_device_init."); |
1428 | alsa_device_init(); | |
1429 | alsa_device_initialised = 1; | |
c5ff0dfe | 1430 | } |
2c40f23f MB |
1431 | } |
1432 | ||
fd880056 MB |
1433 | static int standard_delay_and_status(snd_pcm_state_t *state, snd_pcm_sframes_t *delay, |
1434 | yndk_type *using_update_timestamps) { | |
129343c1 | 1435 | int ret = alsa_handle_status; |
60c2bf27 MB |
1436 | if (using_update_timestamps) |
1437 | *using_update_timestamps = YNDK_NO; | |
713492a7 MB |
1438 | |
1439 | snd_pcm_state_t state_temp = SND_PCM_STATE_DISCONNECTED; | |
1440 | snd_pcm_sframes_t delay_temp = 0; | |
1441 | if (alsa_handle != NULL) { | |
1442 | state_temp = snd_pcm_state(alsa_handle); | |
1443 | if ((state_temp == SND_PCM_STATE_RUNNING) || (state_temp == SND_PCM_STATE_DRAINING)) { | |
1444 | ret = snd_pcm_delay(alsa_handle, &delay_temp); | |
1445 | } else { | |
1446 | // not running, thus no delay information, thus can't check for frame | |
1447 | // rates | |
1448 | // frame_index = 0; // we'll be starting over... | |
1449 | // measurement_data_is_valid = 0; | |
1450 | // delay_temp = 0; | |
1451 | ret = 0; | |
1452 | } | |
30510e72 MB |
1453 | } // else { |
1454 | // debug(1, "alsa_handle is NULL in standard_delay_and_status."); | |
1455 | // } | |
c8b0be30 | 1456 | |
60c2bf27 MB |
1457 | stall_monitor_start_time = 0; // zero if not initialised / not started / zeroed by flush |
1458 | stall_monitor_frame_count = 0; // set to delay at start of time, incremented by any writes | |
1459 | ||
9bac04e2 MB |
1460 | if (delay != NULL) |
1461 | *delay = delay_temp; | |
1462 | if (state != NULL) | |
1463 | *state = state_temp; | |
60c2bf27 MB |
1464 | return ret; |
1465 | } | |
1466 | ||
fd880056 MB |
1467 | static int precision_delay_and_status(snd_pcm_state_t *state, snd_pcm_sframes_t *delay, |
1468 | yndk_type *using_update_timestamps) { | |
8476e5ef MB |
1469 | snd_pcm_state_t state_temp = SND_PCM_STATE_DISCONNECTED; |
1470 | snd_pcm_sframes_t delay_temp = 0; | |
1471 | if (using_update_timestamps) | |
1472 | *using_update_timestamps = YNDK_DONT_KNOW; | |
129343c1 | 1473 | int ret = alsa_handle_status; |
9bac04e2 | 1474 | |
59d26918 MB |
1475 | snd_pcm_status_t *alsa_snd_pcm_status; |
1476 | snd_pcm_status_alloca(&alsa_snd_pcm_status); | |
c8b0be30 | 1477 | |
59d26918 MB |
1478 | struct timespec tn; // time now |
1479 | snd_htimestamp_t update_timestamp; // actually a struct timespec | |
8476e5ef MB |
1480 | if (alsa_handle != NULL) { |
1481 | ret = snd_pcm_status(alsa_handle, alsa_snd_pcm_status); | |
1482 | if (ret == 0) { | |
1483 | snd_pcm_status_get_htstamp(alsa_snd_pcm_status, &update_timestamp); | |
1484 | ||
1485 | /* | |
1486 | // must be 1.1 or later to use snd_pcm_status_get_driver_htstamp | |
1487 | #if SND_LIB_MINOR != 0 | |
1488 | snd_htimestamp_t driver_htstamp; | |
1489 | snd_pcm_status_get_driver_htstamp(alsa_snd_pcm_status, &driver_htstamp); | |
1490 | uint64_t driver_htstamp_ns = driver_htstamp.tv_sec; | |
1491 | driver_htstamp_ns = driver_htstamp_ns * 1000000000; | |
1492 | driver_htstamp_ns = driver_htstamp_ns + driver_htstamp.tv_nsec; | |
1493 | debug(1,"driver_htstamp: %f.", driver_htstamp_ns * 0.000000001); | |
1494 | #endif | |
1495 | */ | |
1496 | ||
1497 | state_temp = snd_pcm_status_get_state(alsa_snd_pcm_status); | |
1498 | ||
1499 | if ((state_temp == SND_PCM_STATE_RUNNING) || (state_temp == SND_PCM_STATE_DRAINING)) { | |
1500 | ||
1501 | // uint64_t update_timestamp_ns = | |
1502 | // update_timestamp.tv_sec * (uint64_t)1000000000 + update_timestamp.tv_nsec; | |
1503 | ||
1504 | uint64_t update_timestamp_ns = update_timestamp.tv_sec; | |
1505 | update_timestamp_ns = update_timestamp_ns * 1000000000; | |
1506 | update_timestamp_ns = update_timestamp_ns + update_timestamp.tv_nsec; | |
1507 | ||
1508 | // if the update_timestamp is zero, we take this to mean that the device doesn't report | |
1509 | // interrupt timings. (It could be that it's not a real hardware device.) | |
1510 | // so we switch to getting the delay the regular way | |
1511 | // i.e. using snd_pcm_delay () | |
1512 | if (using_update_timestamps) { | |
1513 | if (update_timestamp_ns == 0) | |
1514 | *using_update_timestamps = YNDK_NO; | |
1515 | else | |
1516 | *using_update_timestamps = YNDK_YES; | |
1517 | } | |
59d26918 | 1518 | |
8476e5ef MB |
1519 | // user information |
1520 | if (update_timestamp_ns == 0) { | |
1521 | if (delay_type_notified != 1) { | |
1522 | debug(2, "alsa: update timestamps unavailable"); | |
1523 | delay_type_notified = 1; | |
1524 | } | |
1525 | } else { | |
1526 | // diagnostic | |
1527 | if (delay_type_notified != 0) { | |
1528 | debug(2, "alsa: update timestamps available"); | |
1529 | delay_type_notified = 0; | |
1530 | } | |
1531 | } | |
0e37f7e7 | 1532 | |
8476e5ef MB |
1533 | if (update_timestamp_ns == 0) { |
1534 | ret = snd_pcm_delay(alsa_handle, &delay_temp); | |
1535 | } else { | |
1536 | delay_temp = snd_pcm_status_get_delay(alsa_snd_pcm_status); | |
f10fb93e | 1537 | |
8476e5ef MB |
1538 | /* |
1539 | // It seems that the alsa library uses CLOCK_REALTIME before 1.0.28, even though | |
1540 | // the check for monotonic returns true. Might have to watch out for this. | |
1541 | #if SND_LIB_MINOR == 0 && SND_LIB_SUBMINOR < 28 | |
1542 | clock_gettime(CLOCK_REALTIME, &tn); | |
1543 | #else | |
1544 | clock_gettime(CLOCK_MONOTONIC, &tn); | |
1545 | #endif | |
1546 | */ | |
f10fb93e | 1547 | |
8476e5ef MB |
1548 | if (use_monotonic_clock) |
1549 | clock_gettime(CLOCK_MONOTONIC, &tn); | |
1550 | else | |
1551 | clock_gettime(CLOCK_REALTIME, &tn); | |
1552 | ||
1553 | // uint64_t time_now_ns = tn.tv_sec * (uint64_t)1000000000 + tn.tv_nsec; | |
1554 | uint64_t time_now_ns = tn.tv_sec; | |
1555 | time_now_ns = time_now_ns * 1000000000; | |
1556 | time_now_ns = time_now_ns + tn.tv_nsec; | |
1557 | ||
1558 | // see if it's stalled | |
1559 | ||
1560 | if ((stall_monitor_start_time != 0) && (stall_monitor_frame_count == delay_temp)) { | |
1561 | // hasn't outputted anything since the last call to delay() | |
1562 | ||
1563 | if (((update_timestamp_ns - stall_monitor_start_time) > | |
1564 | stall_monitor_error_threshold) || | |
1565 | ((time_now_ns - stall_monitor_start_time) > stall_monitor_error_threshold)) { | |
1566 | debug(2, | |
1567 | "DAC seems to have stalled with time_now_ns: %" PRIX64 | |
1568 | ", update_timestamp_ns: %" PRIX64 ", stall_monitor_start_time %" PRIX64 | |
1569 | ", stall_monitor_error_threshold %" PRIX64 ".", | |
1570 | time_now_ns, update_timestamp_ns, stall_monitor_start_time, | |
1571 | stall_monitor_error_threshold); | |
1572 | debug(2, | |
1573 | "DAC seems to have stalled with time_now: %lx,%lx" | |
1574 | ", update_timestamp: %lx,%lx, stall_monitor_start_time %" PRIX64 | |
1575 | ", stall_monitor_error_threshold %" PRIX64 ".", | |
1576 | tn.tv_sec, tn.tv_nsec, update_timestamp.tv_sec, update_timestamp.tv_nsec, | |
1577 | stall_monitor_start_time, stall_monitor_error_threshold); | |
1578 | ret = sps_extra_code_output_stalled; | |
1579 | } | |
1580 | } else { | |
1581 | stall_monitor_start_time = update_timestamp_ns; | |
1582 | stall_monitor_frame_count = delay_temp; | |
1583 | } | |
fd4c429b | 1584 | |
8476e5ef MB |
1585 | if (ret == 0) { |
1586 | uint64_t delta = time_now_ns - update_timestamp_ns; | |
fd4c429b | 1587 | |
8476e5ef MB |
1588 | // uint64_t frames_played_since_last_interrupt = |
1589 | // ((uint64_t)config.output_rate * delta) / 1000000000; | |
c8b0be30 | 1590 | |
8476e5ef MB |
1591 | uint64_t frames_played_since_last_interrupt = config.output_rate; |
1592 | frames_played_since_last_interrupt = frames_played_since_last_interrupt * delta; | |
1593 | frames_played_since_last_interrupt = frames_played_since_last_interrupt / 1000000000; | |
5e143fe6 | 1594 | |
8476e5ef MB |
1595 | snd_pcm_sframes_t frames_played_since_last_interrupt_sized = |
1596 | frames_played_since_last_interrupt; | |
1597 | if ((frames_played_since_last_interrupt_sized < 0) || | |
1598 | ((uint64_t)frames_played_since_last_interrupt_sized != | |
1599 | frames_played_since_last_interrupt)) | |
1600 | debug(1, | |
1601 | "overflow resizing frames_played_since_last_interrupt %" PRIx64 | |
1602 | " to frames_played_since_last_interrupt %lx.", | |
1603 | frames_played_since_last_interrupt, frames_played_since_last_interrupt_sized); | |
1604 | delay_temp = delay_temp - frames_played_since_last_interrupt_sized; | |
ecee220b | 1605 | } |
ecee220b | 1606 | } |
8476e5ef MB |
1607 | } else { // not running, thus no delay information, thus can't check for |
1608 | // stall | |
1609 | delay_temp = 0; | |
1610 | stall_monitor_start_time = 0; // zero if not initialised / not started / zeroed by flush | |
1611 | stall_monitor_frame_count = 0; // set to delay at start of time, incremented by any writes | |
1612 | ||
1613 | // not running, thus no delay information, thus can't check for frame | |
1614 | // rates | |
1615 | // frame_index = 0; // we'll be starting over... | |
1616 | // measurement_data_is_valid = 0; | |
6f8b35d1 | 1617 | } |
8476e5ef MB |
1618 | } else { |
1619 | debug(1, "alsa: can't get device's status."); | |
6f8b35d1 | 1620 | } |
8476e5ef | 1621 | |
48043a81 | 1622 | } else { |
129343c1 | 1623 | debug(2, "alsa_handle is NULL in precision_delay_and_status!"); |
59d26918 | 1624 | } |
9bac04e2 MB |
1625 | if (delay != NULL) |
1626 | *delay = delay_temp; | |
1627 | if (state != NULL) | |
1628 | *state = state_temp; | |
59d26918 MB |
1629 | return ret; |
1630 | } | |
1631 | ||
fd880056 | 1632 | static int delay(long *the_delay) { |
555bb97a MB |
1633 | // returns 0 if the device is in a valid state -- SND_PCM_STATE_RUNNING or |
1634 | // SND_PCM_STATE_PREPARED | |
59d26918 MB |
1635 | // or SND_PCM_STATE_DRAINING |
1636 | // and returns the actual delay if running or 0 if prepared in *the_delay | |
1637 | ||
1638 | // otherwise return an error code | |
1639 | // the error code could be a Unix errno code or a snderror code, or | |
555bb97a MB |
1640 | // the sps_extra_code_output_stalled or the |
1641 | // sps_extra_code_output_state_cannot_make_ready codes | |
59d26918 | 1642 | int ret = 0; |
9bac04e2 | 1643 | snd_pcm_sframes_t my_delay = 0; |
59d26918 | 1644 | |
561a1296 MB |
1645 | int oldState; |
1646 | ||
1647 | snd_pcm_state_t state; | |
59d26918 | 1648 | |
561a1296 MB |
1649 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable |
1650 | pthread_cleanup_debug_mutex_lock(&alsa_mutex, 10000, 0); | |
59d26918 | 1651 | |
129343c1 | 1652 | ret = delay_and_status(&state, &my_delay, NULL); |
59d26918 | 1653 | |
561a1296 MB |
1654 | debug_mutex_unlock(&alsa_mutex, 0); |
1655 | pthread_cleanup_pop(0); | |
1656 | pthread_setcancelstate(oldState, NULL); | |
1657 | ||
8476e5ef | 1658 | if (the_delay != NULL) // can't imagine why this might happen |
9bac04e2 | 1659 | *the_delay = my_delay; // note: snd_pcm_sframes_t is a long |
59d26918 | 1660 | |
6f8b35d1 MB |
1661 | return ret; |
1662 | } | |
1663 | ||
fd880056 MB |
1664 | static int stats(uint64_t *raw_measurement_time, uint64_t *corrected_measurement_time, |
1665 | uint64_t *the_delay, uint64_t *frames_sent_to_dac) { | |
5f8e6e39 MB |
1666 | // returns 0 if the device is in a valid state -- SND_PCM_STATE_RUNNING or |
1667 | // SND_PCM_STATE_PREPARED | |
136071a6 MB |
1668 | // or SND_PCM_STATE_DRAINING. |
1669 | // returns the actual delay if running or 0 if prepared in *the_delay | |
1670 | // returns the present value of frames_sent_for_playing | |
1671 | // otherwise return a non-zero value | |
5f8e6e39 MB |
1672 | int ret = 0; |
1673 | *the_delay = 0; | |
1674 | ||
1675 | int oldState; | |
1676 | ||
1677 | snd_pcm_state_t state; | |
1678 | snd_pcm_sframes_t my_delay = 0; // this initialisation is to silence a clang warning | |
1679 | ||
1680 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable | |
1681 | pthread_cleanup_debug_mutex_lock(&alsa_mutex, 10000, 0); | |
1682 | ||
1683 | if (alsa_handle == NULL) { | |
129343c1 | 1684 | ret = alsa_handle_status; |
5f8e6e39 | 1685 | } else { |
56bef8e7 MB |
1686 | *raw_measurement_time = |
1687 | get_absolute_time_in_ns(); // this is not conditioned ("disciplined") by NTP | |
1688 | *corrected_measurement_time = get_monotonic_time_in_ns(); // this is ("disciplined") by NTP | |
5f8e6e39 MB |
1689 | ret = delay_and_status(&state, &my_delay, NULL); |
1690 | } | |
1691 | if (ret == 0) | |
136071a6 MB |
1692 | ret = frames_sent_break_occurred; // will be zero unless an error like an underrun occurred |
1693 | else | |
dc5b8f1a MB |
1694 | ret = 1; // just indicate there was some kind of a break |
1695 | frames_sent_break_occurred = 0; // reset it. | |
5f8e6e39 MB |
1696 | if (frames_sent_to_dac != NULL) |
1697 | *frames_sent_to_dac = frames_sent_for_playing; | |
1698 | debug_mutex_unlock(&alsa_mutex, 0); | |
1699 | pthread_cleanup_pop(0); | |
1700 | pthread_setcancelstate(oldState, NULL); | |
1701 | uint64_t hd = my_delay; // note: snd_pcm_sframes_t is a long | |
1702 | *the_delay = hd; | |
1703 | return ret; | |
1704 | } | |
c85e7e05 | 1705 | |
fd880056 | 1706 | static int do_play(void *buf, int samples) { |
bd81e733 | 1707 | // assuming the alsa_mutex has been acquired |
76387f82 MB |
1708 | int ret = 0; |
1709 | if ((samples != 0) && (buf != NULL)) { | |
59d26918 | 1710 | |
76387f82 MB |
1711 | int oldState; |
1712 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable | |
59d26918 | 1713 | |
76387f82 MB |
1714 | snd_pcm_state_t state; |
1715 | snd_pcm_sframes_t my_delay; | |
1716 | ret = delay_and_status(&state, &my_delay, NULL); | |
59d26918 | 1717 | |
76387f82 | 1718 | if (ret == 0) { // will be non-zero if an error or a stall |
e4c82b77 | 1719 | // just check the state of the DAC |
59d26918 | 1720 | |
bd81e733 MB |
1721 | if ((state != SND_PCM_STATE_PREPARED) && (state != SND_PCM_STATE_RUNNING) && |
1722 | (state != SND_PCM_STATE_XRUN)) { | |
1723 | debug(1, "alsa: DAC in odd SND_PCM_STATE_* %d prior to writing.", state); | |
1724 | } | |
80f15e1f | 1725 | |
e4c82b77 | 1726 | snd_pcm_state_t prior_state = state; // keep this for afterwards.... |
f058d118 | 1727 | // debug(3, "alsa: write %d frames.", samples); |
bd81e733 | 1728 | ret = alsa_pcm_write(alsa_handle, buf, samples); |
8490c4c1 MB |
1729 | if (ret > 0) |
1730 | frames_sent_for_playing += ret; // this is the number of frames accepted | |
bd81e733 MB |
1731 | if (ret == samples) { |
1732 | stall_monitor_frame_count += samples; | |
bd81e733 | 1733 | } else { |
136071a6 | 1734 | frames_sent_break_occurred = 1; // note than an output error has occurred |
dc5b8f1a | 1735 | if (ret == -EPIPE) { /* underrun */ |
e4c82b77 MB |
1736 | |
1737 | // It could be that the DAC was in the SND_PCM_STATE_XRUN state before | |
1738 | // sending the samples to be output. If so, it will still be in | |
1739 | // the SND_PCM_STATE_XRUN state after the call and it needs to be recovered. | |
1740 | ||
1741 | // The underrun occurred in the past, so flagging an | |
1742 | // error at this point is misleading. | |
1743 | ||
1744 | // In fact, having put samples in the buffer, we are about to fix it by now | |
1745 | // issuing a snd_pcm_recover(). | |
1746 | ||
1747 | // So, if state is SND_PCM_STATE_XRUN now, only report it if the state was | |
1748 | // not SND_PCM_STATE_XRUN prior to the call, i.e. report it only | |
1749 | // if we are not trying to recover from a previous underrun. | |
1750 | ||
1751 | if (prior_state == SND_PCM_STATE_XRUN) | |
0c7d385f | 1752 | debug(1, "alsa: recovering from a previous underrun."); |
e4c82b77 MB |
1753 | else |
1754 | debug(1, "alsa: underrun while writing %d samples to alsa device.", samples); | |
76387f82 | 1755 | ret = snd_pcm_recover(alsa_handle, ret, 1); |
bd81e733 | 1756 | } else if (ret == -ESTRPIPE) { /* suspended */ |
76387f82 MB |
1757 | if (state != prior_state) |
1758 | debug(1, "alsa: suspended while writing %d samples to alsa device.", samples); | |
1759 | if ((ret = snd_pcm_resume(alsa_handle)) == -ENOSYS) | |
1760 | ret = snd_pcm_prepare(alsa_handle); | |
1761 | } else if (ret >= 0) { | |
1762 | debug(1, "alsa: only %d of %d samples output.", ret, samples); | |
59d26918 | 1763 | } |
59d26918 MB |
1764 | } |
1765 | } | |
76387f82 MB |
1766 | pthread_setcancelstate(oldState, NULL); |
1767 | if (ret < 0) { | |
1768 | char errorstring[1024]; | |
1769 | strerror_r(-ret, (char *)errorstring, sizeof(errorstring)); | |
1770 | debug(1, "alsa: SND_PCM_STATE_* %d, error %d (\"%s\") writing %d samples to alsa device.", | |
1771 | state, ret, (char *)errorstring, samples); | |
1772 | } | |
b5bb2fef | 1773 | if ((ret == -ENOENT) || (ret == -ENODEV)) // if the device isn't there... |
76387f82 | 1774 | handle_unfixable_error(-ret); |
59d26918 | 1775 | } |
59d26918 MB |
1776 | return ret; |
1777 | } | |
1778 | ||
fd880056 | 1779 | static int do_open(int do_auto_setup) { |
bd81e733 MB |
1780 | int ret = 0; |
1781 | if (alsa_backend_state != abm_disconnected) | |
555bb97a MB |
1782 | debug(1, "alsa: do_open() -- opening the output device when it is already " |
1783 | "connected"); | |
bd81e733 MB |
1784 | if (alsa_handle == NULL) { |
1785 | // debug(1,"alsa: do_open() -- opening the output device"); | |
83c0405d | 1786 | ret = open_alsa_device(do_auto_setup); |
bd81e733 | 1787 | if (ret == 0) { |
555bb97a | 1788 | mute_requested_internally = 0; |
bd81e733 MB |
1789 | if (audio_alsa.volume) |
1790 | do_volume(set_volume); | |
555bb97a | 1791 | if (audio_alsa.mute) { |
60487c86 | 1792 | debug(2, "do_open() set_mute_state"); |
555bb97a MB |
1793 | set_mute_state(); // the mute_requested_externally flag will have been |
1794 | // set accordingly | |
1795 | // do_mute(0); // complete unmute | |
1796 | } | |
136071a6 | 1797 | frames_sent_break_occurred = 1; // there is a discontinuity with |
dc5b8f1a | 1798 | // any previously-reported frame count |
99c66385 | 1799 | frames_sent_for_playing = 0; |
b02e5d9f | 1800 | alsa_backend_state = abm_connected; // only do this if it really opened it. |
76387f82 | 1801 | } else { |
b5bb2fef | 1802 | if ((ret == -ENOENT) || (ret == -ENODEV)) // if the device isn't there... |
76387f82 | 1803 | handle_unfixable_error(-ret); |
bd81e733 | 1804 | } |
bd81e733 MB |
1805 | } else { |
1806 | debug(1, "alsa: do_open() -- output device already open."); | |
1807 | } | |
1808 | return ret; | |
1809 | } | |
1810 | ||
fd880056 | 1811 | static int do_close() { |
a382ac66 | 1812 | debug(2, "alsa: do_close()"); |
bd81e733 | 1813 | if (alsa_backend_state == abm_disconnected) |
555bb97a MB |
1814 | debug(1, "alsa: do_close() -- closing the output device when it is already " |
1815 | "disconnected"); | |
bd81e733 MB |
1816 | int derr = 0; |
1817 | if (alsa_handle) { | |
1818 | // debug(1,"alsa: do_close() -- closing the output device"); | |
1819 | if ((derr = snd_pcm_drop(alsa_handle))) | |
1820 | debug(1, "Error %d (\"%s\") dropping output device.", derr, snd_strerror(derr)); | |
2bc62c7d MB |
1821 | usleep(10000); // wait for the hardware to do its trick. BTW, this make the function pthread |
1822 | // cancellable | |
bd81e733 MB |
1823 | if ((derr = snd_pcm_hw_free(alsa_handle))) |
1824 | debug(1, "Error %d (\"%s\") freeing the output device hardware.", derr, snd_strerror(derr)); | |
c8075134 | 1825 | debug(2, "alsa: do_close() -- closing alsa handle"); |
bd81e733 MB |
1826 | if ((derr = snd_pcm_close(alsa_handle))) |
1827 | debug(1, "Error %d (\"%s\") closing the output device.", derr, snd_strerror(derr)); | |
1828 | alsa_handle = NULL; | |
129343c1 | 1829 | alsa_handle_status = ENODEV; // no device open |
bd81e733 MB |
1830 | } else { |
1831 | debug(1, "alsa: do_close() -- output device already closed."); | |
1832 | } | |
1833 | alsa_backend_state = abm_disconnected; | |
1834 | return derr; | |
1835 | } | |
1836 | ||
fd880056 | 1837 | static int sub_flush() { |
70ef99e9 MB |
1838 | if (alsa_backend_state == abm_disconnected) |
1839 | debug(1, "alsa: do_flush() -- closing the output device when it is already " | |
1840 | "disconnected"); | |
1841 | int derr = 0; | |
1842 | if (alsa_handle) { | |
9bac04e2 | 1843 | debug(2, "alsa: do_flush() -- flushing the output device"); |
70ef99e9 MB |
1844 | frames_sent_break_occurred = 1; |
1845 | if ((derr = snd_pcm_drop(alsa_handle))) | |
1846 | debug(1, "Error %d (\"%s\") dropping output device.", derr, snd_strerror(derr)); | |
1847 | if ((derr = snd_pcm_prepare(alsa_handle))) | |
1848 | debug(1, "Error %d (\"%s\") preparing output device after flush.", derr, snd_strerror(derr)); | |
0b4b4a73 | 1849 | alsa_backend_state = abm_connected; |
70ef99e9 MB |
1850 | } else { |
1851 | debug(1, "alsa: do_flush() -- output device already closed."); | |
1852 | } | |
1853 | return derr; | |
1854 | } | |
1855 | ||
fd880056 MB |
1856 | static int play(void *buf, int samples, __attribute__((unused)) int sample_type, |
1857 | __attribute__((unused)) uint32_t timestamp, | |
1858 | __attribute__((unused)) uint64_t playtime) { | |
bd81e733 MB |
1859 | |
1860 | // play() will change the state of the alsa_backend_mode to abm_playing | |
555bb97a MB |
1861 | // also, if the present alsa_backend_state is abm_disconnected, then first the |
1862 | // DAC must be | |
bd81e733 MB |
1863 | // connected |
1864 | ||
1865 | // debug(3,"audio_alsa play called."); | |
1866 | int ret = 0; | |
1867 | ||
14aa9d41 | 1868 | pthread_cleanup_debug_mutex_lock(&alsa_mutex, 50000, 0); |
bd81e733 MB |
1869 | |
1870 | if (alsa_backend_state == abm_disconnected) { | |
83c0405d | 1871 | ret = do_open(0); // don't try to auto setup |
b02e5d9f | 1872 | if (ret == 0) |
c8075134 | 1873 | debug(2, "alsa: play() -- opened output device"); |
555bb97a | 1874 | } |
bd81e733 MB |
1875 | |
1876 | if (ret == 0) { | |
1877 | if (alsa_backend_state != abm_playing) { | |
c8075134 | 1878 | debug(2, "alsa: play() -- alsa_backend_state => abm_playing"); |
bd81e733 | 1879 | alsa_backend_state = abm_playing; |
c8b0be30 | 1880 | |
0c552148 | 1881 | // mute_requested_internally = 0; // stop requesting a mute for backend's own |
c8b0be30 MB |
1882 | // reasons, which might have been a flush |
1883 | // debug(2, "play() set_mute_state"); | |
1884 | // set_mute_state(); // try to action the request and return a status | |
555bb97a | 1885 | // do_mute(0); // unmute for backend's reason |
bd81e733 MB |
1886 | } |
1887 | ret = do_play(buf, samples); | |
1888 | } | |
1889 | ||
1890 | debug_mutex_unlock(&alsa_mutex, 0); | |
1891 | pthread_cleanup_pop(0); // release the mutex | |
1892 | return ret; | |
1893 | } | |
1894 | ||
fd880056 | 1895 | static int prepare(void) { |
c8b0be30 | 1896 | // this will leave the DAC open / connected. |
83c0405d MB |
1897 | int ret = 0; |
1898 | ||
1899 | pthread_cleanup_debug_mutex_lock(&alsa_mutex, 50000, 0); | |
1900 | ||
1901 | if (alsa_backend_state == abm_disconnected) { | |
e8a92d3c | 1902 | if (alsa_device_initialised == 0) { |
1b4c9b17 | 1903 | // debug(1, "alsa: prepare() calling alsa_device_init."); |
e8a92d3c MB |
1904 | alsa_device_init(); |
1905 | alsa_device_initialised = 1; | |
1906 | } | |
c8b0be30 | 1907 | ret = do_open(1); // do auto setup |
83c0405d MB |
1908 | if (ret == 0) |
1909 | debug(2, "alsa: prepare() -- opened output device"); | |
83c0405d MB |
1910 | } |
1911 | ||
1912 | debug_mutex_unlock(&alsa_mutex, 0); | |
1913 | pthread_cleanup_pop(0); // release the mutex | |
1914 | return ret; | |
1915 | } | |
1916 | ||
2c40f23f | 1917 | static void flush(void) { |
fff33fe6 | 1918 | // debug(2,"audio_alsa flush called."); |
ea20840d | 1919 | pthread_cleanup_debug_mutex_lock(&alsa_mutex, 10000, 1); |
bd81e733 | 1920 | if (alsa_backend_state != abm_disconnected) { // must be playing or connected... |
a295c2a2 | 1921 | // do nothing for a flush if config.keep_dac_busy is true |
70ef99e9 MB |
1922 | if (config.keep_dac_busy == 0) { |
1923 | sub_flush(); | |
7cc434e9 | 1924 | } |
a295c2a2 | 1925 | } else { |
c8075134 | 1926 | debug(3, "alsa: flush() -- called on a disconnected alsa backend"); |
a295c2a2 | 1927 | } |
93f41059 | 1928 | debug_mutex_unlock(&alsa_mutex, 3); |
ea20840d | 1929 | pthread_cleanup_pop(0); // release the mutex |
95035f33 M |
1930 | } |
1931 | ||
1932 | static void stop(void) { | |
0b4b4a73 MB |
1933 | pthread_cleanup_debug_mutex_lock(&alsa_mutex, 10000, 1); |
1934 | if (alsa_backend_state != abm_disconnected) { // must be playing or connected... | |
1935 | if (config.keep_dac_busy == 0) { | |
1936 | do_close(); | |
1937 | } | |
1938 | } else | |
1939 | debug(3, "alsa: stop() -- called on a disconnected alsa backend"); | |
1940 | debug_mutex_unlock(&alsa_mutex, 3); | |
1941 | pthread_cleanup_pop(0); // release the mutex | |
95035f33 M |
1942 | } |
1943 | ||
87a0475c | 1944 | static void parameters(audio_parameters *info) { |
87a0475c MB |
1945 | info->minimum_volume_dB = alsa_mix_mindb; |
1946 | info->maximum_volume_dB = alsa_mix_maxdb; | |
a2790fc1 MB |
1947 | } |
1948 | ||
fd880056 MB |
1949 | static void do_volume(double vol) { // caller is assumed to have the alsa_mutex when |
1950 | // using this function | |
5dd9fbc4 | 1951 | debug(3, "Setting volume db to %f.", vol); |
3b4654df MB |
1952 | int oldState; |
1953 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldState); // make this un-cancellable | |
b0bfbdc0 | 1954 | set_volume = vol; |
0c552148 | 1955 | pthread_cleanup_debug_mutex_lock(&alsa_mixer_mutex, 1000, 1); |
76387f82 | 1956 | if (volume_set_request && (open_mixer() == 0)) { |
f3dcf8d6 JK |
1957 | if (has_softvol) { |
1958 | if (ctl && elem_id) { | |
1959 | snd_ctl_elem_value_t *value; | |
1960 | long raw; | |
1961 | ||
90f779dc | 1962 | if (snd_ctl_convert_from_dB(ctl, elem_id, vol, &raw, 0) < 0) |
064bd293 MB |
1963 | debug(1, "Failed converting dB gain to raw volume value for the " |
1964 | "software volume control."); | |
f3dcf8d6 JK |
1965 | |
1966 | snd_ctl_elem_value_alloca(&value); | |
1967 | snd_ctl_elem_value_set_id(value, elem_id); | |
1968 | snd_ctl_elem_value_set_integer(value, 0, raw); | |
1969 | snd_ctl_elem_value_set_integer(value, 1, raw); | |
1970 | if (snd_ctl_elem_write(ctl, value) < 0) | |
064bd293 MB |
1971 | debug(1, "Failed to set playback dB volume for the software volume " |
1972 | "control."); | |
f3dcf8d6 JK |
1973 | } |
1974 | } else { | |
e0aa75a8 | 1975 | if (volume_based_mute_is_active == 0) { |
6d792fa0 | 1976 | // debug(1,"Set alsa volume."); |
8a4bfb03 | 1977 | do_snd_mixer_selem_set_playback_dB_all(alsa_mix_elem, vol); |
6d792fa0 | 1978 | } else { |
69b3b5d7 | 1979 | debug(2, "Not setting volume because volume-based mute is active"); |
f3dcf8d6 | 1980 | } |
ae0c9745 | 1981 | } |
fc492bea | 1982 | volume_set_request = 0; // any external request that has been made is now satisfied |
eb1b7c37 | 1983 | close_mixer(); |
4e395ff3 | 1984 | } |
0c552148 MB |
1985 | debug_mutex_unlock(&alsa_mixer_mutex, 3); |
1986 | pthread_cleanup_pop(0); // release the mutex | |
3b4654df | 1987 | pthread_setcancelstate(oldState, NULL); |
fc492bea MB |
1988 | } |
1989 | ||
fd880056 | 1990 | static void volume(double vol) { |
fc492bea MB |
1991 | volume_set_request = 1; // an external request has been made to set the volume |
1992 | do_volume(vol); | |
95035f33 | 1993 | } |
ba02dee4 | 1994 | |
eb1b7c37 | 1995 | /* |
ba02dee4 | 1996 | static void linear_volume(double vol) { |
ae0c9745 MB |
1997 | debug(2, "Setting linear volume to %f.", vol); |
1998 | set_volume = vol; | |
e8a92d3c | 1999 | if ((alsa_mix_ctrl == NULL) && alsa_mix_handle) { |
ae0c9745 MB |
2000 | double linear_volume = pow(10, vol); |
2001 | // debug(1,"Linear volume is %f.",linear_volume); | |
555bb97a MB |
2002 | long int_vol = alsa_mix_minv + (alsa_mix_maxv - alsa_mix_minv) * |
2003 | linear_volume; | |
ae0c9745 MB |
2004 | // debug(1,"Setting volume to %ld, for volume input of %f.",int_vol,vol); |
2005 | if (alsa_mix_handle) { | |
2006 | if (snd_mixer_selem_set_playback_volume_all(alsa_mix_elem, int_vol) != 0) | |
2007 | die("Failed to set playback volume"); | |
eb1b7c37 | 2008 | |
ae0c9745 MB |
2009 | } |
2010 | } | |
4c70223f | 2011 | } |
eb1b7c37 | 2012 | */ |
4c70223f | 2013 | |
fd880056 | 2014 | static int mute(int mute_state_requested) { // these would be for external reasons, not |
2c0250b3 MB |
2015 | // because of the |
2016 | // state of the backend. | |
555bb97a | 2017 | mute_requested_externally = mute_state_requested; // request a mute for external reasons |
60487c86 | 2018 | debug(2, "mute(%d) set_mute_state", mute_state_requested); |
555bb97a | 2019 | return set_mute_state(); |
fc492bea | 2020 | } |
bd81e733 | 2021 | /* |
fd880056 | 2022 | static void alsa_buffer_monitor_thread_cleanup_function(__attribute__((unused)) void |
555bb97a | 2023 | *arg) { |
7cc434e9 MB |
2024 | debug(1, "alsa: alsa_buffer_monitor_thread_cleanup_function called."); |
2025 | } | |
bd81e733 | 2026 | */ |
7cc434e9 | 2027 | |
fd880056 | 2028 | static void *alsa_buffer_monitor_thread_code(__attribute__((unused)) void *arg) { |
cd9982c4 MB |
2029 | int frame_count = 0; |
2030 | int error_count = 0; | |
a8faacd3 | 2031 | int error_detected = 0; |
97a4766e | 2032 | int okb = -1; |
2bc62c7d MB |
2033 | // if too many play errors occur early on, we will turn off the disable standby mode |
2034 | while (error_detected == 0) { | |
2035 | int keep_dac_busy_has_just_gone_off = 0; | |
97a4766e | 2036 | if (okb != config.keep_dac_busy) { |
2bc62c7d MB |
2037 | if ((okb != 0) && (config.keep_dac_busy == 0)) |
2038 | keep_dac_busy_has_just_gone_off = 1; | |
c8b0be30 | 2039 | debug(2, "keep_dac_busy is now \"%s\"", config.keep_dac_busy == 0 ? "no" : "yes"); |
97a4766e MB |
2040 | okb = config.keep_dac_busy; |
2041 | } | |
c5ff0dfe | 2042 | if ((config.keep_dac_busy != 0) && (alsa_device_initialised == 0)) { |
60487c86 | 2043 | debug(2, "alsa: alsa_buffer_monitor_thread_code() calling " |
e8a92d3c MB |
2044 | "alsa_device_init."); |
2045 | alsa_device_init(); | |
2046 | alsa_device_initialised = 1; | |
c5ff0dfe | 2047 | } |
67e9b1b6 | 2048 | int sleep_time_us = (int)(config.disable_standby_mode_silence_scan_interval * 1000000); |
f3865d77 | 2049 | pthread_cleanup_debug_mutex_lock(&alsa_mutex, 200000, 0); |
fd08511f | 2050 | // check possible state transitions here |
9fb37e42 MB |
2051 | if ((alsa_backend_state == abm_disconnected) && (config.keep_dac_busy != 0)) { |
2052 | // open the dac and move to abm_connected mode | |
83c0405d | 2053 | if (do_open(1) == 0) // no automatic setup of rate and speed if necessary |
555bb97a MB |
2054 | debug(2, "alsa: alsa_buffer_monitor_thread_code() -- output device opened; " |
2055 | "alsa_backend_state => abm_connected"); | |
2bc62c7d | 2056 | } else if ((alsa_backend_state != abm_disconnected) && (keep_dac_busy_has_just_gone_off != 0)) { |
9fb37e42 | 2057 | stall_monitor_start_time = 0; |
99c66385 MB |
2058 | // frame_index = 0; |
2059 | // measurement_data_is_valid = 0; | |
555bb97a MB |
2060 | debug(2, "alsa: alsa_buffer_monitor_thread_code() -- closing the output " |
2061 | "device"); | |
9fb37e42 | 2062 | do_close(); |
555bb97a MB |
2063 | debug(2, "alsa: alsa_buffer_monitor_thread_code() -- alsa_backend_state " |
2064 | "=> abm_disconnected"); | |
9fb37e42 MB |
2065 | } |
2066 | // now, if the backend is not in the abm_disconnected state | |
555bb97a MB |
2067 | // and config.keep_dac_busy is true (at the present, this has to be the case |
2068 | // to be in the | |
2069 | // abm_connected state in the first place...) then do the silence-filling | |
dbea82c2 | 2070 | // thing, if needed /* only if the output device is capable of precision delay */. |
c8b0be30 MB |
2071 | if ((alsa_backend_state != abm_disconnected) && |
2072 | (config.keep_dac_busy != 0) /* && precision_delay_available() */) { | |
9fb37e42 MB |
2073 | int reply; |
2074 | long buffer_size = 0; | |
2075 | snd_pcm_state_t state; | |
67e9b1b6 MB |
2076 | reply = delay_and_status(&state, &buffer_size, NULL); |
2077 | if (reply != 0) { | |
2078 | buffer_size = 0; | |
2079 | char errorstring[1024]; | |
2080 | strerror_r(-reply, (char *)errorstring, sizeof(errorstring)); | |
2081 | debug(1, "alsa: alsa_buffer_monitor_thread_code delay error %d: \"%s\".", reply, | |
2082 | (char *)errorstring); | |
2083 | } | |
2084 | long buffer_size_threshold = | |
2085 | (long)(config.disable_standby_mode_silence_threshold * config.output_rate); | |
2086 | size_t size_of_silence_buffer; | |
2087 | if (buffer_size < buffer_size_threshold) { | |
2088 | int frames_of_silence = 1024; | |
2089 | size_of_silence_buffer = frames_of_silence * frame_size; | |
2090 | void *silence = malloc(size_of_silence_buffer); | |
2091 | if (silence == NULL) { | |
2092 | warn("disable_standby_mode has been turned off because a memory allocation error " | |
2093 | "occurred."); | |
2094 | error_detected = 1; | |
2095 | } else { | |
2096 | int ret; | |
2097 | pthread_cleanup_push(malloc_cleanup, silence); | |
2098 | int use_dither = 0; | |
2099 | if ((alsa_mix_ctrl == NULL) && (config.ignore_volume_control == 0) && | |
2100 | (config.airplay_volume != 0.0)) | |
2101 | use_dither = 1; | |
2102 | dither_random_number_store = | |
2103 | generate_zero_frames(silence, frames_of_silence, config.output_format, | |
2104 | use_dither, // i.e. with dither | |
2105 | dither_random_number_store); | |
2106 | ret = do_play(silence, frames_of_silence); | |
2107 | frame_count++; | |
2108 | pthread_cleanup_pop(1); // free malloced buffer | |
2109 | if (ret < 0) { | |
2110 | error_count++; | |
2111 | char errorstring[1024]; | |
2112 | strerror_r(-ret, (char *)errorstring, sizeof(errorstring)); | |
54d761ff MB |
2113 | debug(2, |
2114 | "alsa: alsa_buffer_monitor_thread_code error %d (\"%s\") writing %d samples " | |
2115 | "to alsa device -- %d errors in %d trials.", | |
67e9b1b6 MB |
2116 | ret, (char *)errorstring, frames_of_silence, error_count, frame_count); |
2117 | if ((error_count > 40) && (frame_count < 100)) { | |
2118 | warn("disable_standby_mode has been turned off because too many underruns " | |
2119 | "occurred. Is Shairport Sync outputting to a virtual device or running in a " | |
2120 | "virtual machine?"); | |
2121 | error_detected = 1; | |
cd9982c4 | 2122 | } |
ad6c721d | 2123 | } |
4613ee6b | 2124 | } |
ad6c721d | 2125 | } |
7cc434e9 | 2126 | } |
f3865d77 | 2127 | debug_mutex_unlock(&alsa_mutex, 0); |
54d761ff MB |
2128 | pthread_cleanup_pop(0); // release the mutex |
2129 | usleep(sleep_time_us); // has a cancellation point in it | |
7cc434e9 | 2130 | } |
7cc434e9 | 2131 | pthread_exit(NULL); |
c8075134 | 2132 | } |