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ALSA: Add a new config option to use the default channel layout.

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This can sometimes be more reliable than `snd_pcm_get_chmap()`.
This commit is contained in:
David Reid
2025-07-22 15:29:51 +10:00
parent 20b9b9c533
commit 2d4cc9c910
1 changed files with 50 additions and 44 deletions
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miniaudio.h
+6
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@@ -6834,6 +6834,7 @@ typedef struct ma_device_config_alsa
ma_bool32 noAutoFormat; /* Opens the ALSA device with SND_PCM_NO_AUTO_FORMAT. */
ma_bool32 noAutoChannels; /* Opens the ALSA device with SND_PCM_NO_AUTO_CHANNELS. */
ma_bool32 noAutoResample; /* Opens the ALSA device with SND_PCM_NO_AUTO_RESAMPLE. */
ma_bool32 assumeDefaultChannelLayout; /* Forces the use of the "default" ALSA channel layout. */
} ma_device_config_alsa;
MA_API ma_device_config_alsa ma_device_config_alsa_init(void);
@@ -29801,6 +29802,7 @@ static ma_result ma_device_init_by_type__alsa(ma_context* pContext, ma_context_s
/* Grab the internal channel map. For now we're not going to bother trying to change the channel map and instead just do it ourselves. */
{
if (pDeviceConfigALSA->assumeDefaultChannelLayout) {
ma_snd_pcm_chmap_t* pChmap = NULL;
if (pContextStateALSA->snd_pcm_get_chmap != NULL) {
pChmap = pContextStateALSA->snd_pcm_get_chmap(pPCM);
@@ -29855,6 +29857,10 @@ static ma_result ma_device_init_by_type__alsa(ma_context* pContext, ma_context_s
/* Could not retrieve the channel map. Fall back to a hard-coded assumption. */
ma_channel_map_init_standard(ma_standard_channel_map_alsa, internalChannelMap, ma_countof(internalChannelMap), internalChannels);
}
} else {
/* The caller has requested that we always use the default ALSA channel layout. */
ma_channel_map_init_standard(ma_standard_channel_map_alsa, internalChannelMap, ma_countof(internalChannelMap), internalChannels);
}
}