mirror of https://github.com/libsdl-org/SDL
dummyaudio: Configurable delay, other SDL3 API fixes.
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@ -25,33 +25,51 @@
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#include "../SDL_audio_c.h"
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#include "../SDL_audio_c.h"
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#include "SDL_dummyaudio.h"
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#include "SDL_dummyaudio.h"
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/* !!! FIXME: add a dummy WaitDevice to simulate real audio better? */
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/* !!! FIXME: this should be an SDL hint, not an environment variable. */
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#define DUMMYENVR_IODELAY "SDL_DUMMYAUDIODELAY"
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static void DUMMYAUDIO_WaitDevice(SDL_AudioDevice *device)
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{
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SDL_Delay(device->hidden->io_delay);
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}
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static int DUMMYAUDIO_OpenDevice(SDL_AudioDevice *device)
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static int DUMMYAUDIO_OpenDevice(SDL_AudioDevice *device)
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{
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{
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device->hidden = (struct SDL_PrivateAudioData *) SDL_malloc(device->buffer_size);
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const char *envr = SDL_getenv(DUMMYENVR_IODELAY);
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device->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, sizeof(*device->hidden));
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if (!device->hidden) {
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if (!device->hidden) {
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return SDL_OutOfMemory();
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return SDL_OutOfMemory();
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}
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}
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return 0; /* don't change reported device format. */
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if (!device->iscapture) {
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device->hidden->mixbuf = (Uint8 *) SDL_malloc(device->buffer_size);
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if (!device->hidden->mixbuf) {
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return SDL_OutOfMemory();
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}
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}
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device->hidden->io_delay = envr ? SDL_atoi(envr) : ((device->sample_frames * 1000) / device->spec.freq);
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return 0; /* we're good; don't change reported device format. */
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}
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}
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static void DUMMYAUDIO_CloseDevice(SDL_AudioDevice *device)
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static void DUMMYAUDIO_CloseDevice(SDL_AudioDevice *device)
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{
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{
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SDL_free(device->hidden);
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if (device->hidden) {
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device->hidden = NULL;
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SDL_free(device->hidden->mixbuf);
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SDL_free(device->hidden);
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device->hidden = NULL;
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}
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}
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}
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static Uint8 *DUMMYAUDIO_GetDeviceBuf(SDL_AudioDevice *device, int *buffer_size)
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static Uint8 *DUMMYAUDIO_GetDeviceBuf(SDL_AudioDevice *device, int *buffer_size)
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{
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{
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return (Uint8 *) device->hidden;
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return device->hidden->mixbuf;
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}
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}
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static int DUMMYAUDIO_CaptureFromDevice(SDL_AudioDevice *device, void *buffer, int buflen)
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static int DUMMYAUDIO_CaptureFromDevice(SDL_AudioDevice *device, void *buffer, int buflen)
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{
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{
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/* Delay to make this sort of simulate real audio input. */
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SDL_Delay((device->sample_frames * 1000) / device->spec.freq);
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/* always return a full buffer of silence. */
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/* always return a full buffer of silence. */
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SDL_memset(buffer, device->silence_value, buflen);
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SDL_memset(buffer, device->silence_value, buflen);
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return buflen;
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return buflen;
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@ -59,17 +77,18 @@ static int DUMMYAUDIO_CaptureFromDevice(SDL_AudioDevice *device, void *buffer, i
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static SDL_bool DUMMYAUDIO_Init(SDL_AudioDriverImpl *impl)
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static SDL_bool DUMMYAUDIO_Init(SDL_AudioDriverImpl *impl)
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{
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{
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/* Set the function pointers */
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impl->OpenDevice = DUMMYAUDIO_OpenDevice;
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impl->OpenDevice = DUMMYAUDIO_OpenDevice;
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impl->CloseDevice = DUMMYAUDIO_CloseDevice;
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impl->CloseDevice = DUMMYAUDIO_CloseDevice;
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impl->WaitDevice = DUMMYAUDIO_WaitDevice;
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impl->GetDeviceBuf = DUMMYAUDIO_GetDeviceBuf;
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impl->GetDeviceBuf = DUMMYAUDIO_GetDeviceBuf;
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impl->WaitCaptureDevice = DUMMYAUDIO_WaitDevice;
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impl->CaptureFromDevice = DUMMYAUDIO_CaptureFromDevice;
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impl->CaptureFromDevice = DUMMYAUDIO_CaptureFromDevice;
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impl->OnlyHasDefaultOutputDevice = SDL_TRUE;
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impl->OnlyHasDefaultOutputDevice = SDL_TRUE;
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impl->OnlyHasDefaultCaptureDevice = SDL_TRUE;
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impl->OnlyHasDefaultCaptureDevice = SDL_TRUE;
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impl->HasCaptureSupport = SDL_TRUE;
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impl->HasCaptureSupport = SDL_TRUE;
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return SDL_TRUE; /* this audio target is available. */
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return SDL_TRUE;
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}
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}
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AudioBootStrap DUMMYAUDIO_bootstrap = {
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AudioBootStrap DUMMYAUDIO_bootstrap = {
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@ -25,15 +25,11 @@
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#include "../SDL_sysaudio.h"
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#include "../SDL_sysaudio.h"
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/* !!! FIXME: none of this is actually used. Dump this whole file. */
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struct SDL_PrivateAudioData
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struct SDL_PrivateAudioData
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{
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{
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/* The file descriptor for the audio device */
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/* The file descriptor for the audio device */
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Uint8 *mixbuf;
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Uint8 *mixbuf;
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Uint32 mixlen;
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Uint32 io_delay;
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Uint32 write_delay;
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Uint32 initial_calls;
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};
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};
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#endif /* SDL_dummyaudio_h_ */
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#endif /* SDL_dummyaudio_h_ */
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