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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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7
spa/plugins/alsa/alsa-pcm.c
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@ -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) {