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8cabb16f MB |
1 | /* |
2 | * jack output driver. This file is part of Shairport Sync. | |
3 | * Copyright (c) 2018 Mike Brady <mikebrady@iercom.net> | |
4 | * | |
5 | * All rights reserved. | |
6 | * | |
7 | * Permission to use, copy, modify, and distribute this software for any | |
8 | * purpose with or without fee is hereby granted, provided that the above | |
9 | * copyright notice and this permission notice appear in all copies. | |
10 | * | |
11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
18 | */ | |
19 | ||
20 | #include "audio.h" | |
21 | #include "common.h" | |
22 | #include <errno.h> | |
23 | #include <getopt.h> | |
24 | #include <limits.h> | |
25 | #include <math.h> | |
26 | #include <pthread.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
8cabb16f MB |
30 | #include <unistd.h> |
31 | ||
32 | #include <jack/jack.h> | |
33 | #include <jack/transport.h> | |
f07c16a6 | 34 | #include <jack/ringbuffer.h> |
8cabb16f MB |
35 | |
36 | enum ift_type { | |
37 | IFT_frame_left_sample = 0, | |
38 | IFT_frame_right_sample, | |
39 | } ift_type; | |
40 | ||
41 | // Four seconds buffer -- should be plenty | |
42 | #define buffer_size 44100 * 4 * 2 * 2 | |
43 | ||
44 | static pthread_mutex_t buffer_mutex = PTHREAD_MUTEX_INITIALIZER; | |
6c6dda9c | 45 | static pthread_mutex_t client_mutex = PTHREAD_MUTEX_INITIALIZER; |
8cabb16f MB |
46 | |
47 | char *audio_lmb, *audio_umb, *audio_toq, *audio_eoq; | |
48 | size_t audio_occupancy; // this is in frames, not bytes. A frame is a left and | |
49 | // right sample, each 16 bits, hence 4 bytes | |
6c6dda9c MB |
50 | pthread_t *open_client_if_necessary_thread = NULL; |
51 | ||
c1d5815c | 52 | int jack_init(int, char **); |
959aa08b | 53 | void jack_deinit(void); |
8cabb16f MB |
54 | void jack_start(int, int); |
55 | int play(void *, int); | |
56 | void jack_stop(void); | |
57 | int jack_is_running(void); | |
8cabb16f MB |
58 | int jack_delay(long *); |
59 | void jack_flush(void); | |
60 | ||
61 | audio_output audio_jack = {.name = "jack", | |
62 | .help = NULL, | |
c1d5815c | 63 | .init = &jack_init, |
959aa08b | 64 | .deinit = &jack_deinit, |
8cabb16f MB |
65 | .start = &jack_start, |
66 | .stop = &jack_stop, | |
67 | .is_running = &jack_is_running, | |
68 | .flush = &jack_flush, | |
69 | .delay = &jack_delay, | |
70 | .play = &play, | |
71 | .volume = NULL, | |
72 | .parameters = NULL, | |
73 | .mute = NULL}; | |
74 | ||
8cabb16f MB |
75 | jack_port_t *left_port; |
76 | jack_port_t *right_port; | |
959aa08b | 77 | |
8cabb16f | 78 | long offset = 0; |
8cabb16f MB |
79 | |
80 | int client_is_open; | |
81 | jack_client_t *client; | |
82 | jack_nframes_t sample_rate; | |
c1d5815c | 83 | jack_nframes_t jack_latency; |
8cabb16f | 84 | |
f07c16a6 JN |
85 | static jack_ringbuffer_t *jackbuf; |
86 | ||
39545cdf | 87 | jack_latency_range_t latest_left_latency_range, latest_right_latency_range; |
959aa08b | 88 | int64_t time_of_latest_transfer; |
8cabb16f MB |
89 | |
90 | int play(void *buf, int samples) { | |
91 | // debug(1,"jack_play of %d samples.",samples); | |
92 | // copy the samples into the queue | |
93 | size_t bytes_to_transfer = samples * 2 * 2; | |
94 | size_t space_to_end_of_buffer = audio_umb - audio_eoq; | |
95 | if (space_to_end_of_buffer >= bytes_to_transfer) { | |
96 | memcpy(audio_eoq, buf, bytes_to_transfer); | |
97 | pthread_mutex_lock(&buffer_mutex); | |
98 | audio_occupancy += samples; | |
99 | audio_eoq += bytes_to_transfer; | |
100 | pthread_mutex_unlock(&buffer_mutex); | |
101 | } else { | |
102 | memcpy(audio_eoq, buf, space_to_end_of_buffer); | |
103 | buf += space_to_end_of_buffer; | |
104 | memcpy(audio_lmb, buf, bytes_to_transfer - space_to_end_of_buffer); | |
105 | pthread_mutex_lock(&buffer_mutex); | |
106 | audio_occupancy += samples; | |
107 | audio_eoq = audio_lmb + bytes_to_transfer - space_to_end_of_buffer; | |
108 | pthread_mutex_unlock(&buffer_mutex); | |
109 | } | |
8cabb16f MB |
110 | return 0; |
111 | } | |
112 | ||
113 | void deinterleave_and_convert_stream(const char *interleaved_frames, | |
959aa08b | 114 | const jack_default_audio_sample_t *jack_frame_buffer, |
8cabb16f MB |
115 | jack_nframes_t number_of_frames, enum ift_type side) { |
116 | jack_nframes_t i; | |
117 | short *ifp = (short *)interleaved_frames; | |
959aa08b | 118 | jack_default_audio_sample_t *fp = (jack_default_audio_sample_t *)jack_frame_buffer; |
8cabb16f MB |
119 | if (side == IFT_frame_right_sample) |
120 | ifp++; | |
121 | for (i = 0; i < number_of_frames; i++) { | |
122 | short sample = *ifp; | |
959aa08b | 123 | jack_default_audio_sample_t converted_value; |
8cabb16f MB |
124 | if (sample >= 0) |
125 | converted_value = (1.0 * sample) / SHRT_MAX; | |
126 | else | |
127 | converted_value = -(1.0 * sample) / SHRT_MIN; | |
128 | *fp = converted_value; | |
129 | ifp++; | |
130 | ifp++; | |
131 | fp++; | |
132 | } | |
133 | } | |
134 | ||
135 | int jack_stream_write_cb(jack_nframes_t nframes, __attribute__((unused)) void *arg) { | |
136 | ||
959aa08b MB |
137 | jack_default_audio_sample_t *left_buffer = |
138 | (jack_default_audio_sample_t *)jack_port_get_buffer(left_port, nframes); | |
139 | jack_default_audio_sample_t *right_buffer = | |
140 | (jack_default_audio_sample_t *)jack_port_get_buffer(right_port, nframes); | |
8cabb16f MB |
141 | |
142 | size_t frames_we_can_transfer = nframes; | |
143 | // lock | |
144 | pthread_mutex_lock(&buffer_mutex); | |
145 | if (audio_occupancy < frames_we_can_transfer) { | |
146 | frames_we_can_transfer = audio_occupancy; | |
175d91a4 MB |
147 | // This means we effectively have underflow from the Shairport Sync source. |
148 | // In fact, it may be that there is nothing at all coming from the source, | |
149 | // but the Shairport Sync client is open and active, so it must continue to output something. | |
8cabb16f MB |
150 | } |
151 | ||
8cabb16f MB |
152 | if (frames_we_can_transfer * 2 * 2 <= (size_t)(audio_umb - audio_toq)) { |
153 | // the bytes are all in a row in the audio buffer | |
154 | deinterleave_and_convert_stream(audio_toq, &left_buffer[0], frames_we_can_transfer, | |
155 | IFT_frame_left_sample); | |
156 | deinterleave_and_convert_stream(audio_toq, &right_buffer[0], frames_we_can_transfer, | |
157 | IFT_frame_right_sample); | |
158 | audio_toq += frames_we_can_transfer * 2 * 2; | |
159 | } else { | |
160 | // the bytes are in two places in the audio buffer | |
161 | size_t first_portion_to_write = (audio_umb - audio_toq) / (2 * 2); | |
162 | if (first_portion_to_write != 0) { | |
163 | deinterleave_and_convert_stream(audio_toq, &left_buffer[0], first_portion_to_write, | |
164 | IFT_frame_left_sample); | |
165 | deinterleave_and_convert_stream(audio_toq, &right_buffer[0], first_portion_to_write, | |
166 | IFT_frame_right_sample); | |
167 | } | |
168 | deinterleave_and_convert_stream(audio_lmb, &left_buffer[first_portion_to_write], | |
169 | frames_we_can_transfer - first_portion_to_write, | |
170 | IFT_frame_left_sample); | |
171 | deinterleave_and_convert_stream(audio_lmb, &right_buffer[first_portion_to_write], | |
172 | frames_we_can_transfer - first_portion_to_write, | |
173 | IFT_frame_right_sample); | |
174 | audio_toq = audio_lmb + (frames_we_can_transfer - first_portion_to_write) * 2 * 2; | |
175 | } | |
176 | // debug(1,"transferring %u frames",frames_we_can_transfer); | |
177 | audio_occupancy -= frames_we_can_transfer; | |
959aa08b MB |
178 | jack_port_get_latency_range(left_port, JackPlaybackLatency, &latest_left_latency_range); |
179 | jack_port_get_latency_range(right_port, JackPlaybackLatency, &latest_right_latency_range); | |
180 | time_of_latest_transfer = get_absolute_time_in_fp(); | |
8cabb16f MB |
181 | pthread_mutex_unlock(&buffer_mutex); |
182 | // unlock | |
959aa08b MB |
183 | |
184 | // now, if there are any more frames to put into the buffer, fill them with | |
8cabb16f MB |
185 | // silence |
186 | jack_nframes_t i; | |
8cabb16f MB |
187 | for (i = frames_we_can_transfer; i < nframes; i++) { |
188 | left_buffer[i] = 0.0; | |
189 | right_buffer[i] = 0.0; | |
190 | } | |
8cabb16f MB |
191 | return 0; |
192 | } | |
193 | ||
959aa08b | 194 | void default_jack_error_callback(const char *desc) { debug(2, "jackd error: \"%s\"", desc); } |
8cabb16f | 195 | |
959aa08b | 196 | void default_jack_info_callback(const char *desc) { inform("jackd information: \"%s\"", desc); } |
8cabb16f | 197 | |
c1d5815c MB |
198 | void default_jack_set_latency_callback(jack_latency_callback_mode_t mode, |
199 | __attribute__((unused)) void *arg) { | |
200 | if (mode == JackPlaybackLatency) { | |
201 | jack_latency_range_t left_latency_range, right_latency_range; | |
202 | jack_port_get_latency_range(left_port, JackPlaybackLatency, &left_latency_range); | |
203 | jack_port_get_latency_range(right_port, JackPlaybackLatency, &right_latency_range); | |
204 | ||
205 | jack_nframes_t b_latency = (left_latency_range.min + left_latency_range.max) / 2; | |
206 | if (b_latency == 0) | |
207 | b_latency = (right_latency_range.min + right_latency_range.max) / 2; | |
208 | // jack_latency = b_latency; // actually, we are not interested in the latency of the jack | |
209 | // devices connected... | |
210 | jack_latency = 0; | |
211 | debug(1, "playback latency callback: %" PRIu32 ".", jack_latency); | |
212 | } | |
213 | } | |
214 | ||
8cabb16f | 215 | int jack_is_running() { |
76138873 | 216 | int reply = -1; // meaning jack is not running |
8cabb16f MB |
217 | // if the client is open and initialised, see if the status is "rolling" |
218 | if (client_is_open) { | |
76138873 MB |
219 | |
220 | // check if the ports have a zero latency -- if they both have, then it's disconnected. | |
221 | ||
222 | jack_latency_range_t left_latency_range, right_latency_range; | |
223 | jack_port_get_latency_range(left_port, JackPlaybackLatency, &left_latency_range); | |
224 | jack_port_get_latency_range(right_port, JackPlaybackLatency, &right_latency_range); | |
225 | ||
c1d5815c MB |
226 | // if ((left_latency_range.min == 0) && (left_latency_range.max == 0) && |
227 | // (right_latency_range.min == 0) && (right_latency_range.max == 0)) { | |
228 | // reply = -2; // meaning Shairport Sync is not connected | |
229 | // } else { | |
230 | reply = 0; // meaning jack is open and Shairport Sync is connected to it | |
231 | // } | |
8cabb16f MB |
232 | } |
233 | return reply; | |
234 | } | |
235 | ||
959aa08b | 236 | int jack_client_open_if_needed(void) { |
6c6dda9c | 237 | pthread_mutex_lock(&client_mutex); |
959aa08b MB |
238 | if (client_is_open == 0) { |
239 | jack_status_t status; | |
240 | client = jack_client_open(config.jack_client_name, JackNoStartServer, &status); | |
241 | if (client) { | |
242 | jack_set_process_callback(client, jack_stream_write_cb, 0); | |
243 | left_port = jack_port_register(client, config.jack_left_channel_name, JACK_DEFAULT_AUDIO_TYPE, | |
244 | JackPortIsOutput, 0); | |
245 | right_port = jack_port_register(client, config.jack_right_channel_name, | |
246 | JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0); | |
247 | sample_rate = jack_get_sample_rate(client); | |
248 | // debug(1, "jackaudio sample rate = %" PRId32 ".", sample_rate); | |
249 | if (sample_rate == 44100) { | |
c1d5815c MB |
250 | if (jack_set_latency_callback(client, default_jack_set_latency_callback, NULL) == 0) { |
251 | if (jack_activate(client)) { | |
252 | debug(1, "jackaudio cannot activate client"); | |
253 | } else { | |
254 | debug(2, "jackaudio client opened."); | |
255 | client_is_open = 1; | |
256 | } | |
959aa08b | 257 | } else { |
c1d5815c | 258 | debug(1, "jackaudio cannot set latency callback"); |
959aa08b MB |
259 | } |
260 | } else { | |
261 | inform( | |
262 | "jackaudio is running at the wrong speed (%d) for Shairport Sync, which must be 44100", | |
263 | sample_rate); | |
264 | } | |
265 | } | |
266 | } | |
6c6dda9c | 267 | pthread_mutex_unlock(&client_mutex); |
959aa08b MB |
268 | return client_is_open; |
269 | } | |
270 | ||
6c6dda9c MB |
271 | void jack_close(void) { |
272 | pthread_mutex_lock(&client_mutex); | |
959aa08b MB |
273 | if (client_is_open) { |
274 | if (jack_deactivate(client)) | |
275 | debug(1, "Error deactivating jack client"); | |
276 | if (jack_client_close(client)) | |
277 | debug(1, "Error closing jack client"); | |
6c6dda9c MB |
278 | client_is_open = 0; |
279 | } | |
280 | pthread_mutex_unlock(&client_mutex); | |
281 | } | |
282 | ||
283 | void jack_deinit() { | |
284 | jack_close(); | |
285 | if (open_client_if_necessary_thread) { | |
286 | pthread_cancel(*open_client_if_necessary_thread); | |
287 | free((char *)open_client_if_necessary_thread); | |
f07c16a6 JN |
288 | |
289 | jack_ringbuffer_free(jackbuf); | |
290 | ||
959aa08b MB |
291 | } |
292 | } | |
293 | ||
6c6dda9c MB |
294 | void *open_client_if_necessary_thread_function(void *arg) { |
295 | int *interval = (int *)arg; | |
296 | while (*interval != 0) { | |
297 | if (client_is_open == 0) { | |
298 | debug(1, "Try to open the jack client"); | |
299 | jack_client_open_if_needed(); | |
300 | } | |
301 | sleep(*interval); | |
39545cdf | 302 | } |
6c6dda9c MB |
303 | pthread_exit(NULL); |
304 | } | |
305 | ||
c1d5815c | 306 | int jack_init(__attribute__((unused)) int argc, __attribute__((unused)) char **argv) { |
8cabb16f | 307 | config.audio_backend_latency_offset = 0; |
76138873 | 308 | config.audio_backend_buffer_desired_length = 0.500; |
80f15e1f MB |
309 | config.audio_backend_buffer_interpolation_threshold_in_seconds = |
310 | 0.25; // below this, soxr interpolation will not occur -- it'll be basic interpolation | |
311 | // instead. | |
6c6dda9c | 312 | config.jack_auto_client_open_interval = 1; // check every second |
8cabb16f MB |
313 | |
314 | // get settings from settings file first, allow them to be overridden by | |
315 | // command line options | |
316 | ||
317 | // do the "general" audio options. Note, these options are in the "general" stanza! | |
318 | parse_general_audio_options(); | |
959aa08b | 319 | |
8cabb16f MB |
320 | // other options would be picked up here... |
321 | ||
959aa08b MB |
322 | // now the specific options |
323 | if (config.cfg != NULL) { | |
324 | const char *str; | |
6c6dda9c | 325 | int value; |
959aa08b MB |
326 | /* Get the Client Name. */ |
327 | if (config_lookup_string(config.cfg, "jack.client_name", &str)) { | |
328 | config.jack_client_name = (char *)str; | |
329 | } | |
330 | /* Get the Left Channel Name. */ | |
331 | if (config_lookup_string(config.cfg, "jack.left_channel_name", &str)) { | |
332 | config.jack_left_channel_name = (char *)str; | |
333 | } | |
334 | /* Get the Right Channel Name. */ | |
335 | if (config_lookup_string(config.cfg, "jack.right_channel_name", &str)) { | |
336 | config.jack_right_channel_name = (char *)str; | |
337 | } | |
39545cdf MB |
338 | |
339 | /* See if we should attempt to connect to the jack server automatically, and, if so, how often | |
340 | * we should try. */ | |
6c6dda9c MB |
341 | if (config_lookup_int(config.cfg, "jack.auto_client_open_interval", &value)) { |
342 | if ((value < 0) || (value > 300)) | |
2e442853 MB |
343 | debug(1, |
344 | "Invalid jack auto_client_open_interval \"%sd\". It should be between 0 and 300, " | |
345 | "default is %d.", | |
76138873 | 346 | value, config.jack_auto_client_open_interval); |
6c6dda9c MB |
347 | else |
348 | config.jack_auto_client_open_interval = value; | |
349 | } | |
350 | ||
351 | /* See if we should close the client at then end of a play session. */ | |
39545cdf MB |
352 | config_set_lookup_bool(config.cfg, "jack.auto_client_disconnect", |
353 | &config.jack_auto_client_disconnect); | |
959aa08b MB |
354 | } |
355 | ||
356 | if (config.jack_client_name == NULL) | |
357 | config.jack_client_name = strdup("Shairport Sync"); | |
358 | if (config.jack_left_channel_name == NULL) | |
359 | config.jack_left_channel_name = strdup("left"); | |
360 | if (config.jack_right_channel_name == NULL) | |
361 | config.jack_right_channel_name = strdup("right"); | |
362 | ||
f07c16a6 JN |
363 | jackbuf = jack_ringbuffer_create(buffer_size); // make the jack ringbuffer the same size as audio_lmb |
364 | jack_ringbuffer_mlock(jackbuf); // lock buffer into memory so that it never gets paged out | |
365 | ||
959aa08b | 366 | jack_set_error_function(default_jack_error_callback); |
8cabb16f | 367 | jack_set_info_function(default_jack_info_callback); |
8cabb16f MB |
368 | |
369 | // allocate space for the audio buffer | |
370 | audio_lmb = malloc(buffer_size); | |
371 | if (audio_lmb == NULL) | |
372 | die("Can't allocate %d bytes for jackaudio buffer.", buffer_size); | |
373 | audio_toq = audio_eoq = audio_lmb; | |
374 | audio_umb = audio_lmb + buffer_size; | |
375 | audio_occupancy = 0; // frames | |
959aa08b MB |
376 | |
377 | client_is_open = 0; | |
39545cdf | 378 | |
175d91a4 | 379 | // now, if selected, start a thread to automatically open a client when there is a server. |
6c6dda9c MB |
380 | if (config.jack_auto_client_open_interval != 0) { |
381 | open_client_if_necessary_thread = malloc(sizeof(pthread_t)); | |
175d91a4 | 382 | if (open_client_if_necessary_thread == NULL) { |
76138873 | 383 | debug(1, "Couldn't allocate space for jack server scanner thread"); |
175d91a4 MB |
384 | jack_client_open_if_needed(); |
385 | } else { | |
76138873 MB |
386 | pthread_create(open_client_if_necessary_thread, NULL, |
387 | open_client_if_necessary_thread_function, | |
388 | &config.jack_auto_client_open_interval); | |
175d91a4 | 389 | } |
6c6dda9c MB |
390 | } else { |
391 | jack_client_open_if_needed(); | |
392 | } | |
959aa08b | 393 | |
8cabb16f MB |
394 | return 0; |
395 | } | |
396 | ||
959aa08b MB |
397 | void jack_start(__attribute__((unused)) int i_sample_rate, |
398 | __attribute__((unused)) int i_sample_format) { | |
6c6dda9c | 399 | // debug(1, "jack start"); |
959aa08b MB |
400 | // see if the client is running. If not, try to open and initialise it |
401 | ||
402 | if (jack_client_open_if_needed() == 0) | |
403 | debug(1, "cannot open a jack client for a play session"); | |
8cabb16f MB |
404 | } |
405 | ||
406 | int jack_delay(long *the_delay) { | |
39545cdf | 407 | |
959aa08b | 408 | // without the mutex, we could get the time of what is the last transfer of data to a jack buffer, |
39545cdf MB |
409 | // but then a transfer could occur and we would get the buffer occupancy after another transfer |
410 | // had occurred | |
411 | // so we could "lose" a full transfer (e.g. 1024 frames @ 44,100 fps ~ 23.2 milliseconds) | |
412 | pthread_mutex_lock(&buffer_mutex); | |
959aa08b | 413 | int64_t time_now = get_absolute_time_in_fp(); |
39545cdf MB |
414 | int64_t delta = time_now - time_of_latest_transfer; // this is the time back to the last time data |
415 | // was transferred into a jack buffer | |
416 | size_t audio_occupancy_now = audio_occupancy; // this is the buffer occupancy before any | |
76138873 MB |
417 | // subsequent transfer because transfer is blocked |
418 | // by the mutex | |
959aa08b MB |
419 | pthread_mutex_unlock(&buffer_mutex); |
420 | ||
8cabb16f | 421 | int64_t frames_processed_since_latest_latency_check = (delta * 44100) >> 32; |
8cabb16f | 422 | // debug(1,"delta: %" PRId64 " frames.",frames_processed_since_latest_latency_check); |
39545cdf | 423 | jack_nframes_t base_latency = (latest_left_latency_range.min + latest_left_latency_range.max) / 2; |
959aa08b | 424 | if (base_latency == 0) |
39545cdf MB |
425 | base_latency = (latest_right_latency_range.min + latest_right_latency_range.max) / 2; |
426 | *the_delay = base_latency + audio_occupancy_now - frames_processed_since_latest_latency_check; | |
8cabb16f MB |
427 | // debug(1,"reporting a delay of %d frames",*the_delay); |
428 | ||
429 | return 0; | |
430 | } | |
431 | ||
432 | void jack_flush() { | |
959aa08b | 433 | // debug(1,"jack flush"); |
8cabb16f MB |
434 | pthread_mutex_lock(&buffer_mutex); |
435 | audio_toq = audio_eoq = audio_lmb; | |
436 | audio_umb = audio_lmb + buffer_size; | |
437 | audio_occupancy = 0; // frames | |
438 | pthread_mutex_unlock(&buffer_mutex); | |
8cabb16f MB |
439 | } |
440 | ||
6c6dda9c MB |
441 | void jack_stop(void) { |
442 | // debug(1, "jack stop"); | |
443 | if (config.jack_auto_client_disconnect) | |
444 | jack_close(); | |
aa5698fc | 445 | } |