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FS-8161: mod_opus: Keep FEC enabled only if loss > 10 ( otherwise PLC is supposed to be better)

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This commit is contained in:
Dragos Oancea 2015-09-17 12:52:55 -04:00
parent e7d11375ad
commit 6385fb863a
1 changed files with 53 additions and 10 deletions
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63
src/mod/codecs/mod_opus/mod_opus.c
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@ -309,6 +309,33 @@ static switch_bool_t switch_opus_has_fec(const uint8_t* payload,int payload_leng
return SWITCH_FALSE;
}
/* this is only useful for fs = 8000 hz, the map is only used
* at the beginning of the call. */
static int switch_opus_get_fec_bitrate(int fs, int loss)
{
int threshold_bitrates[25] = {
15600,15200,15200,15200,14800,
14800,14800,14800,14400,14400,
14400,14000,14000,14000,13600,
13600,13600,13600,13200,13200,
13200,12800,12800,12800,12400
};
if (loss <= 0){
return SWITCH_STATUS_FALSE;
}
if (fs == 8000) {
if (loss >=25) {
return threshold_bitrates[24];
} else {
return threshold_bitrates[loss-1];
}
}
return SWITCH_STATUS_FALSE ;
}
static switch_status_t switch_opus_info(void * encoded_data, uint32_t len, uint32_t samples_per_second, char *print_text)
{
int nb_samples;
@ -493,7 +520,20 @@ static switch_status_t switch_opus_init(switch_codec_t *codec, switch_codec_flag
}
if (opus_codec_settings.useinbandfec) {
/* FEC on the encoder: start the call with a preconfigured packet loss percentage */
int fec_bitrate = opus_codec_settings.maxaveragebitrate;
int loss_percent = opus_prefs.plpct ;
opus_encoder_ctl(context->encoder_object, OPUS_SET_INBAND_FEC(opus_codec_settings.useinbandfec));
opus_encoder_ctl(context->encoder_object, OPUS_SET_PACKET_LOSS_PERC(loss_percent));
if (opus_prefs.keep_fec){
fec_bitrate = switch_opus_get_fec_bitrate(enc_samplerate,loss_percent);
/* keep a bitrate for which the encoder will always add FEC */
if (fec_bitrate != SWITCH_STATUS_FALSE) {
opus_encoder_ctl(context->encoder_object, OPUS_SET_BITRATE(fec_bitrate));
/* will override the maxaveragebitrate set in opus.conf.xml */
opus_codec_settings.maxaveragebitrate = fec_bitrate;
}
}
}
if (opus_codec_settings.usedtx) {
@ -954,18 +994,21 @@ static switch_status_t switch_opus_control(switch_codec_t *codec,
plpct = 100;
}
calc = plpct % 10;
plpct = plpct - calc + ( calc ? 10 : 0);
if (opus_prefs.plpct > 0 && plpct < opus_prefs.plpct) {
plpct = opus_prefs.plpct;
}
if (plpct != context->old_plpct) {
if (opus_prefs.keep_fec) {
opus_encoder_ctl(context->encoder_object, OPUS_SET_PACKET_LOSS_PERC(plpct));
} else {
calc = plpct % 10;
plpct = plpct - calc + ( calc ? 10 : 0);
}
if (plpct != context->old_plpct) {
if (opus_prefs.keep_fec) {
switch_opus_keep_fec_enabled(codec);
if (plpct > 10) {
/* this will increase bitrate a little bit, just to keep FEC enabled */
switch_opus_keep_fec_enabled(codec);
}
} else {
/* this can have no effect because FEC is F(bitrate,packetloss), let the codec decide if FEC is to be used or not */
opus_encoder_ctl(context->encoder_object, OPUS_SET_PACKET_LOSS_PERC(plpct));
}
if (globals.debug || context->debug) {