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bluez5: aptx-ll: produce 7.5ms packets

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Put a bit more samples to packets to make it more robust.  The 7.5ms
interval may also fit better with other BT devices.
This commit is contained in:
Pauli Virtanen 2024-02-04 23:32:18 +02:00
parent 8f2a239504
commit 83050e647b
3 changed files with 33 additions and 2 deletions
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20
spa/plugins/bluez5/a2dp-codec-aptx.c
View file

@ -300,8 +300,17 @@ static void *codec_init(const struct media_codec *codec, uint32_t flags,
void *config, size_t config_len, const struct spa_audio_info *info,
void *props, size_t mtu)
{
struct impl *this;
struct impl *this = NULL;
a2dp_aptx_t conf;
int res;
int frequency;
if (config_len < sizeof(conf)) {
res = -EINVAL;
goto error;
}
memcpy(&conf, config, sizeof(conf));
if ((this = calloc(1, sizeof(struct impl))) == NULL)
goto error_errno;
@ -322,10 +331,17 @@ static void *codec_init(const struct media_codec *codec, uint32_t flags,
this->frame_length = this->hd ? 6 : 4;
this->codesize = 4 * 3 * 2;
frequency = media_codec_get_config(aptx_frequencies, SPA_N_ELEMENTS(aptx_frequencies), conf.frequency);
if (frequency < 0) {
res = -EINVAL;
goto error;
}
if (this->hd)
this->max_frames = (this->mtu - sizeof(struct rtp_header)) / this->frame_length;
else if (codec_is_ll(codec))
this->max_frames = SPA_MIN(256u, this->mtu) / this->frame_length;
/* try to make 7.5ms packets */
this->max_frames = SPA_MIN((unsigned)frequency * 75u/10000u / 4u, this->mtu / this->frame_length);
else
this->max_frames = this->mtu / this->frame_length;

12
spa/plugins/bluez5/media-codecs.c
View file

@ -61,6 +61,18 @@ int media_codec_select_config(const struct media_codec_config configs[], size_t
return res;
}
int media_codec_get_config(const struct media_codec_config configs[], size_t n,
uint32_t conf)
{
size_t i;
for (i = 0; i < n; ++i)
if (configs[i].config == conf)
return configs[i].value;
return -EINVAL;
}
bool media_codec_check_caps(const struct media_codec *codec, unsigned int codec_id,
const void *caps, size_t caps_size,
const struct media_codec_audio_info *info,

3
spa/plugins/bluez5/media-codecs.h
View file

@ -198,6 +198,9 @@ struct media_codec_config {
int media_codec_select_config(const struct media_codec_config configs[], size_t n,
uint32_t cap, int preferred_value);
int media_codec_get_config(const struct media_codec_config configs[], size_t n,
uint32_t conf);
bool media_codec_check_caps(const struct media_codec *codec, unsigned int codec_id,
const void *caps, size_t caps_size, const struct media_codec_audio_info *info,
const struct spa_dict *global_settings);