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SDL2: Fill the SDL_AudioSpec in add_device()

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vanfanel
2025-07-20 14:23:45 +02:00
committed by Ryan C. Gordon
parent 874ca5a678
commit 34691de22b
1 changed files with 41 additions and 5 deletions
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46
src/audio/alsa/SDL_alsa_audio.c
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@@ -62,6 +62,7 @@ static int (*ALSA_snd_pcm_hw_params_set_access)(snd_pcm_t *, snd_pcm_hw_params_t
static int (*ALSA_snd_pcm_hw_params_set_format)(snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_format_t);
static int (*ALSA_snd_pcm_hw_params_set_channels)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int);
static int (*ALSA_snd_pcm_hw_params_get_channels)(const snd_pcm_hw_params_t *, unsigned int *);
static int (*ALSA_snd_pcm_hw_params_get_rate)(snd_pcm_hw_params_t *, unsigned int*, int*);
static int (*ALSA_snd_pcm_hw_params_set_rate_near)(snd_pcm_t *, snd_pcm_hw_params_t *, unsigned int *, int *);
static int (*ALSA_snd_pcm_hw_params_set_period_size_near)(snd_pcm_t *, snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *);
static int (*ALSA_snd_pcm_hw_params_get_period_size)(const snd_pcm_hw_params_t *, snd_pcm_uframes_t *, int *);
@@ -138,6 +139,7 @@ static int load_alsa_syms(void)
SDL_ALSA_SYM(snd_pcm_hw_params_set_format);
SDL_ALSA_SYM(snd_pcm_hw_params_set_channels);
SDL_ALSA_SYM(snd_pcm_hw_params_get_channels);
SDL_ALSA_SYM(snd_pcm_hw_params_get_rate);
SDL_ALSA_SYM(snd_pcm_hw_params_set_rate_near);
SDL_ALSA_SYM(snd_pcm_hw_params_set_period_size_near);
SDL_ALSA_SYM(snd_pcm_hw_params_get_period_size);
@@ -780,6 +782,16 @@ static void add_device(const int iscapture, const char *name, void *hint, ALSA_D
char *desc;
char *handle = NULL;
char *ptr;
snd_pcm_t *pcm_handle;
snd_pcm_stream_t stream;
snd_pcm_hw_params_t *hwparams;
unsigned int freq = 0;
int dir;
unsigned int channels = 0;
snd_pcm_uframes_t samples = 0;
SDL_AudioSpec spec;
if (!dev) {
return;
@@ -819,12 +831,36 @@ static void add_device(const int iscapture, const char *name, void *hint, ALSA_D
SDL_free(dev);
return;
}
stream = iscapture ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK;
if (ALSA_snd_pcm_open(&pcm_handle, handle, stream, SND_PCM_NONBLOCK) < 0) {
SDL_free(dev);
return;
}
/* Note that spec is NULL, because we are required to open the device before
* acquiring the mix format, making this information inaccessible at
* enumeration time
*/
SDL_AddAudioDevice(iscapture, desc, NULL, handle);
snd_pcm_hw_params_alloca(&hwparams);
ALSA_snd_pcm_hw_params_any(pcm_handle, hwparams);
ALSA_snd_pcm_hw_params_get_rate(hwparams, &freq, &dir);
ALSA_snd_pcm_hw_params_get_channels(hwparams, &channels);
ALSA_snd_pcm_hw_params_get_period_size(hwparams, &samples, &dir);
ALSA_snd_pcm_close(pcm_handle);
/* Let's fill the spec */
spec.freq = freq;
spec.channels = channels;
spec.samples = samples;
spec.silence = 0;
spec.padding = 0;
/* Can't calculate size yet because this is an exploratory device opening
* so we don't know the sample format.
* Probably AUDIO_S16SYS/SND_PCM_FORMAT_S16_LE would be a good default
* if required.*/
spec.size = 0;
SDL_AddAudioDevice(iscapture, desc, &spec, handle);
if (hint) {
free(desc);
}