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alsa-pcm: allow setting number of channels

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Allow passing the number of channels when creating a device to
restrict the negotiated channels.
This commit is contained in:
Wim Taymans 2020-07-01 12:54:27 +02:00
parent 267eabaf69
commit 8168dfdbc1
5 changed files with 15 additions and 0 deletions
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2
spa/include/spa/param/audio/raw.h
View file

@ -221,6 +221,8 @@ struct spa_audio_info_raw {
#define SPA_KEY_AUDIO_CHANNEL "audio.channel" /**< an audio channel as string,
* Ex. "FL" */
#define SPA_KEY_AUDIO_CHANNELS "audio.channels" /**< an audio channel count as int */
struct spa_audio_info_dsp {
enum spa_audio_format format; /*< format, one of the DSP formats in enum spa_audio_format_dsp */
};

2
spa/plugins/alsa/alsa-pcm-sink.c
View file

@ -751,6 +751,8 @@ impl_init(const struct spa_handle_factory *factory,
for (i = 0; info && i < info->n_items; i++) {
if (!strcmp(info->items[i].key, SPA_KEY_API_ALSA_PATH)) {
snprintf(this->props.device, 63, "%s", info->items[i].value);
} else if (!strcmp(info->items[i].key, SPA_KEY_AUDIO_CHANNELS)) {
this->default_channels = atoi(info->items[i].value);
}
}

2
spa/plugins/alsa/alsa-pcm-source.c
View file

@ -770,6 +770,8 @@ impl_init(const struct spa_handle_factory *factory,
for (i = 0; info && i < info->n_items; i++) {
if (!strcmp(info->items[i].key, SPA_KEY_API_ALSA_PATH)) {
snprintf(this->props.device, 63, "%s", info->items[i].value);
} else if (!strcmp(info->items[i].key, SPA_KEY_AUDIO_CHANNELS)) {
this->default_channels = atoi(info->items[i].value);
}
}
return 0;

7
spa/plugins/alsa/alsa-pcm.c
View file

@ -357,6 +357,13 @@ spa_alsa_enum_format(struct state *state, int seq, uint32_t start, uint32_t num,
CHECK(snd_pcm_hw_params_get_channels_min(params, &min), "get_channels_min");
CHECK(snd_pcm_hw_params_get_channels_max(params, &max), "get_channels_max");
if (state->default_channels != 0) {
if (min < state->default_channels)
min = state->default_channels;
if (max > state->default_channels)
max = state->default_channels;
}
spa_pod_builder_prop(&b, SPA_FORMAT_AUDIO_channels, 0);
if ((maps = snd_pcm_query_chmaps(hndl)) != NULL) {

2
spa/plugins/alsa/alsa-pcm.h
View file

@ -101,6 +101,8 @@ struct state {
bool have_format;
struct spa_audio_info current_format;
unsigned int default_channels;
snd_pcm_uframes_t buffer_frames;
snd_pcm_uframes_t period_frames;
snd_pcm_format_t format;