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alsa: Use more hints for opening default devices.

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This commit is contained in:
Ryan C. Gordon
2024-12-15 16:20:32 -05:00
parent 576f13ac7c
commit 35360ec4d7
2 changed files with 57 additions and 14 deletions
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23
src/audio/alsa/SDL_alsa_audio.c
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@@ -325,19 +325,20 @@ static char *get_pcm_str(void *handle)
{
SDL_assert(handle != NULL); // SDL2 used NULL to mean "default" but that's not true in SDL3.
ALSA_Device *dev = (ALSA_Device *)handle;
// If the user does not want to go thru the default PCM or the canonical default, the
// the configuration space being _massive_, give the user the ability to specify
// its own PCMs using environment variables. It will have to fit SDL constraints though.
// !!! FIXME: make these into SDL_Hints?
const char *env = SDL_getenv(dev->recording ? "SDL_AUDIO_ALSA_PCM_RECORDING" : "SDL_AUDIO_ALSA_PCM_PLAYBACK");
if (env) {
return SDL_strdup(env);
}
char *pcm_str = NULL;
if (SDL_strlen(dev->id) == 0) {
pcm_str = SDL_strdup("default");
// If the user does not want to go thru the default PCM or the canonical default, the
// the configuration space being _massive_, give the user the ability to specify
// its own PCMs using environment variables. It will have to fit SDL constraints though.
const char *devname = SDL_GetHint(dev->recording ? SDL_HINT_AUDIO_ALSA_DEFAULT_RECORDING_DEVICE : SDL_HINT_AUDIO_ALSA_DEFAULT_PLAYBACK_DEVICE);
if (!devname) {
devname = SDL_GetHint(SDL_HINT_AUDIO_ALSA_DEFAULT_DEVICE);
if (!devname) {
devname = "default";
}
}
pcm_str = SDL_strdup(devname);
} else {
SDL_asprintf(&pcm_str, "%sCARD=%s", ALSA_device_prefix, dev->id);
}