* [mod_opus] add cfg setting to overwrite the fmtp stereo param coming from remote. Eg: incoming SDP has stereo=1 but we want a mono call so we answer with stereo=0.
sprop-stereo will be set to 0 too.
* [core] opus: use switch_core_max_audio_channels() with remote fmtp stereo=1 to allow disabling of stereo.
<param name="complexity" value="10"/>
<param name="use-jb-lookahead" value="true"/>
<param name="keep-fec-enabled" value="true"/>
- <param name="adjust-bitrate" value="true"/>
+ <param name="adjust-bitrate" value="true"/>
+ <param name="mono" value="0"/>
</settings>
</configuration>
<!-- Max capture rate, 8000, 12000, 16000, 24000 and 48000 are valid options -->
<!--<param name="sprop-maxcapturerate" value="0"/>-->
<!-- Enable automatic bitrate variation during the call based on RTCP feedback -->
- <!--<param name="adjust-bitrate" value="1"/>-->
+ <!--<param name="adjust-bitrate" value="1"/>-->
+ <!-- will enforce mono even if the remote party wants stereo. must be used in conjunction with param "max-audio-channels" set to 1 in switch.conf.xml. -->
+ <param name="mono" value="0"/>
</settings>
</configuration>
int debuginfo;
uint32_t use_jb_lookahead;
switch_mutex_t *mutex;
+ int mono;
} opus_prefs;
static struct {
}
if (!strcasecmp(data, "stereo")) {
- codec_settings->stereo = atoi(arg);
+ codec_settings->stereo = opus_prefs.mono ? 0 : atoi(arg);
codec_fmtp->stereo = codec_settings->stereo;
}
opus_codec_settings.usedtx = opus_prefs.use_dtx;
+ if (opus_prefs.mono) {
+ opus_codec_settings.stereo = 0;
+ opus_codec_settings.sprop_stereo = 0;
+ }
+
codec->fmtp_out = gen_fmtp(&opus_codec_settings, codec->memory_pool);
if (encoding) {
if (!switch_opus_acceptable_rate(opus_prefs.sprop_maxcapturerate)) {
opus_prefs.sprop_maxcapturerate = 0; /* value not supported */
}
+ } else if (!strcasecmp(key, "mono")) {
+ opus_prefs.mono = atoi(val);
}
}
}
pmap->adv_channels = 2; /* IKR ???*/
}
if (!zstr((char *) mmap->rm_fmtp) && switch_stristr("stereo=1", (char *) mmap->rm_fmtp)) {
- pmap->channels = 2;
+ uint32_t allow_channels = switch_core_max_audio_channels(0);
+ if (!allow_channels || allow_channels >= 2) { /*default*/
+ pmap->channels = 2;
+ } else { /* allow_channels == 1 */
+ switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Opus: setting 1 audio channel via config.\n");
+ pmap->channels = 1;
+ }
} else {
pmap->channels = 1;
}