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bluez5: account for codec internal delay in latency values

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Encoders and some decoders have additional internal latency that needs
to be accounted for.

This mostly matters for AAC (~40ms), as the other BT codecs have much
lower delays (~5ms).
This commit is contained in:
Pauli Virtanen 2024-02-23 21:04:47 +02:00 • committed by Wim Taymans
parent 1b3b577b8f
commit 2d30ab94c2
10 changed files with 151 additions and 10 deletions
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18
spa/plugins/bluez5/a2dp-codec-opus-g.c
View file

@ -26,6 +26,7 @@
static struct spa_log *log;
struct dec_data {
int32_t delay;
};
struct enc_data {
@ -37,6 +38,8 @@ struct enc_data {
int frame_dms;
int bitrate;
int packet_size;
int32_t delay;
};
struct impl {
@ -334,6 +337,8 @@ static void *codec_init(const struct media_codec *codec, uint32_t flags,
opus_encoder_ctl(this->enc, OPUS_SET_BITRATE(this->e.bitrate));
opus_encoder_ctl(this->enc, OPUS_GET_LOOKAHEAD(&this->e.delay));
/*
* Setup decoder
*/
@ -343,6 +348,8 @@ static void *codec_init(const struct media_codec *codec, uint32_t flags,
goto error;
}
opus_decoder_ctl(this->dec, OPUS_GET_LOOKAHEAD(&this->d.delay));
return this;
error_errno:
@ -487,6 +494,16 @@ static int codec_increase_bitpool(void *data)
return 0;
}
static void codec_get_delay(void *data, uint32_t *encoder, uint32_t *decoder)
{
struct impl *this = data;
if (encoder)
*encoder = this->e.delay;
if (decoder)
*decoder = this->d.delay;
}
static void codec_set_log(struct spa_log *global_log)
{
log = global_log;
@ -516,6 +533,7 @@ const struct media_codec a2dp_codec_opus_g = {
.name = "opus_g",
.description = "Opus",
.fill_caps = codec_fill_caps,
.get_delay = codec_get_delay,
};
MEDIA_CODEC_EXPORT_DEF(