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bluez5: boost A2DP duplex microphone volume by 20 dB

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There doesn't seem to be a way to control the A2DP duplex microphone
HW volume gain, and devices sometimes have very low mic volumes.

Work around this by boosting the software volume scale by +20 dB.  If it
causes clipping, the user can just reduce the volume to bring SW gain
below 1.0.
This commit is contained in:
Pauli Virtanen 2021-08-21 18:37:44 +03:00 • committed by Wim Taymans
parent e08cdf27d5
commit ab5fcf4a66
3 changed files with 102 additions and 14 deletions
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15
spa/plugins/bluez5/a2dp-codec-aptx.c
View file

@ -473,6 +473,20 @@ static int msbc_enum_config(const struct a2dp_codec *codec,
return *param == NULL ? -EIO : 1;
}
static int msbc_validate_config(const struct a2dp_codec *codec, uint32_t flags,
const void *caps, size_t caps_size,
struct spa_audio_info *info)
{
spa_zero(*info);
info->media_type = SPA_MEDIA_TYPE_audio;
info->media_subtype = SPA_MEDIA_SUBTYPE_raw;
info->info.raw.format = SPA_AUDIO_FORMAT_S16_LE;
info->info.raw.channels = 1;
info->info.raw.position[0] = SPA_AUDIO_CHANNEL_MONO;
info->info.raw.rate = 16000;
return 0;
}
static int msbc_reduce_bitpool(void *data)
{
return -ENOTSUP;
@ -679,6 +693,7 @@ static const struct a2dp_codec aptx_ll_msbc = {
.fill_caps = codec_fill_caps,
.select_config = codec_select_config_ll,
.enum_config = msbc_enum_config,
.validate_config = msbc_validate_config,
.init = msbc_init,
.deinit = msbc_deinit,
.get_block_size = msbc_get_block_size,