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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
Download patch file Download diff file Expand all files Collapse all files

20
spa/plugins/bluez5/a2dp-codec-ldac.c
View file

@ -551,6 +551,25 @@ static int codec_encode(void *data,
return src_used;
}
static void codec_get_delay(void *data, uint32_t *encoder, uint32_t *decoder)
{
struct impl *this = data;
if (encoder) {
switch (this->frequency) {
case 96000:
case 88200:
*encoder = 256;
break;
default:
*encoder = 128;
break;
}
}
if (decoder)
*decoder = 0;
}
const struct media_codec a2dp_codec_ldac = {
.id = SPA_BLUETOOTH_AUDIO_CODEC_LDAC,
.codec_id = A2DP_CODEC_VENDOR,
@ -577,6 +596,7 @@ const struct media_codec a2dp_codec_ldac = {
.encode = codec_encode,
.reduce_bitpool = codec_reduce_bitpool,
.increase_bitpool = codec_increase_bitpool,
.get_delay = codec_get_delay,
};
MEDIA_CODEC_EXPORT_DEF(