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audio: Allow querying of device buffer size.

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This commit is contained in:
Ryan C. Gordon
2023-09-13 11:03:17 -04:00
parent cf95721130
commit 2f43f7bc53
7 changed files with 62 additions and 38 deletions
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53
src/audio/SDL_audio.c
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@@ -116,6 +116,30 @@ const char *SDL_GetCurrentAudioDriver(void)
return current_audio.name;
}
static int GetDefaultSampleFramesFromFreq(const int freq)
{
const char *hint = SDL_GetHint(SDL_HINT_AUDIO_DEVICE_SAMPLE_FRAMES);
if (hint) {
const int val = SDL_atoi(hint);
if (val > 0) {
return val;
}
}
if (freq <= 11025) {
return 512;
} else if (freq <= 22050) {
return 1024;
} else if (freq <= 48000) {
return 2048;
} else if (freq <= 96000) {
return 4096;
}
return 8192; // shrug
}
// device management and hotplug...
@@ -238,6 +262,7 @@ static SDL_AudioDevice *CreatePhysicalAudioDevice(const char *name, SDL_bool isc
device->iscapture = iscapture;
SDL_memcpy(&device->spec, spec, sizeof (SDL_AudioSpec));
SDL_memcpy(&device->default_spec, spec, sizeof (SDL_AudioSpec));
device->sample_frames = GetDefaultSampleFramesFromFreq(device->spec.freq);
device->silence_value = SDL_GetSilenceValueForFormat(device->spec.format);
device->handle = handle;
device->prev = NULL;
@@ -1112,7 +1137,7 @@ char *SDL_GetAudioDeviceName(SDL_AudioDeviceID devid)
return retval;
}
int SDL_GetAudioDeviceFormat(SDL_AudioDeviceID devid, SDL_AudioSpec *spec)
int SDL_GetAudioDeviceFormat(SDL_AudioDeviceID devid, SDL_AudioSpec *spec, int *sample_frames)
{
if (!spec) {
return SDL_InvalidParamError("spec");
@@ -1137,6 +1162,9 @@ int SDL_GetAudioDeviceFormat(SDL_AudioDeviceID devid, SDL_AudioSpec *spec)
}
SDL_memcpy(spec, &device->spec, sizeof (SDL_AudioSpec));
if (sample_frames) {
*sample_frames = device->sample_frames;
}
SDL_UnlockMutex(device->lock);
return 0;
@@ -1246,29 +1274,6 @@ static void PrepareAudioFormat(SDL_bool iscapture, SDL_AudioSpec *spec)
}
}
static int GetDefaultSampleFramesFromFreq(const int freq)
{
const char *hint = SDL_GetHint(SDL_HINT_AUDIO_DEVICE_SAMPLE_FRAMES);
if (hint) {
const int val = SDL_atoi(hint);
if (val > 0) {
return val;
}
}
if (freq <= 11025) {
return 512;
} else if (freq <= 22050) {
return 1024;
} else if (freq <= 48000) {
return 2048;
} else if (freq <= 96000) {
return 4096;
}
return 8192; // shrug
}
void SDL_UpdatedAudioDeviceFormat(SDL_AudioDevice *device)
{
device->silence_value = SDL_GetSilenceValueForFormat(device->spec.format);