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Added SDL_HINT_AUDIO_DUMMY_TIMESCALE

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This commit is contained in:
Sam Lantinga
2024-08-03 09:01:26 -07:00
parent 5aa1a48ac3
commit 71574ac985
3 changed files with 38 additions and 20 deletions
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14
src/audio/dummy/SDL_dummyaudio.c
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@@ -25,9 +25,6 @@
#include "../SDL_sysaudio.h"
#include "SDL_dummyaudio.h"
// !!! FIXME: this should be an SDL hint, not an environment variable.
#define DUMMYENVR_IODELAY "SDL_DUMMYAUDIODELAY"
static int DUMMYAUDIO_WaitDevice(SDL_AudioDevice *device)
{
SDL_Delay(device->hidden->io_delay);
@@ -36,8 +33,6 @@ static int DUMMYAUDIO_WaitDevice(SDL_AudioDevice *device)
static int DUMMYAUDIO_OpenDevice(SDL_AudioDevice *device)
{
const char *envr = SDL_getenv(DUMMYENVR_IODELAY);
device->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, sizeof(*device->hidden));
if (!device->hidden) {
return -1;
@@ -50,8 +45,15 @@ static int DUMMYAUDIO_OpenDevice(SDL_AudioDevice *device)
}
}
device->hidden->io_delay = (Uint32) (envr ? SDL_atoi(envr) : ((device->sample_frames * 1000) / device->spec.freq));
device->hidden->io_delay = ((device->sample_frames * 1000) / device->spec.freq);
const char *hint = SDL_GetHint(SDL_HINT_AUDIO_DUMMY_TIMESCALE);
if (hint) {
double scale = SDL_atof(hint);
if (scale >= 0.0) {
device->hidden->io_delay = (Uint32)SDL_round(device->hidden->io_delay * scale);
}
}
return 0; // we're good; don't change reported device format.
}