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bluez5: aac: use maximum possible peak bitrate according to MTU

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Android 11 and newer, in both CBR and VBR modes,
* Sets bitrate (AACENC_BITRATE) to the max_bitrate value of A2DP
* Sets peak bitrate (AACENC_PEAK_BITRATE) according to the maximum data
   which could fit into single audio packet based on MTU

AACENC_BITRATE is used only in CBR mode. For VBR mode, the only limiting
factor is AACENC_PEAK_BITRATE.

Do the same in Pipewire.

Link: https://gitlab.freedesktop.org/pipewire/pipewire/-/work_items/1482#note_2949680
Link: https://cs.android.com/android/platform/superproject/+/android16-qpr2-release:packages/modules/Bluetooth/system/stack/a2dp/a2dp_aac_encoder.cc;drc=37d7b4549f7b8740df1a290f04c20c591a2d3391;l=269
This commit is contained in:
ValdikSS 2026-04-05 19:52:53 +03:00
parent 67dd3549a7
commit 49d5f4f236
1 changed files with 6 additions and 2 deletions
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8
spa/plugins/bluez5/a2dp-codec-aac.c
View file

@ -380,8 +380,12 @@ static void *codec_init(const struct media_codec *codec, uint32_t flags,
// Fragmentation is not implemented yet,
// so make sure every encoded AAC frame fits in (mtu - header)
this->max_bitrate = ((this->mtu - sizeof(struct rtp_header)) * 8 * this->rate) / 1024;
this->max_bitrate = SPA_MIN(this->max_bitrate, get_valid_aac_bitrate(conf));
this->cur_bitrate = this->max_bitrate;
this->cur_bitrate = SPA_MIN(this->max_bitrate, get_valid_aac_bitrate(conf));
spa_log_debug(log, "AAC: max (peak) bitrate: %d, cur bitrate: %d, mode: %d (vbr: %d)",
this->max_bitrate,
this->cur_bitrate,
bitratemode,
conf->vbr);
res = aacEncoder_SetParam(this->aacenc, AACENC_BITRATE, this->cur_bitrate);
if (res != AACENC_OK)