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dummyaudio: Configurable delay, other SDL3 API fixes.

This commit is contained in:
Ryan C. Gordon 2023-07-06 17:18:37 -04:00
parent fb395d3ad7
commit 4ba9c2eade
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GPG Key ID: FA148B892AB48044
2 changed files with 31 additions and 16 deletions
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37
src/audio/dummy/SDL_dummyaudio.c
View File

@ -25,33 +25,51 @@
#include "../SDL_audio_c.h"
#include "SDL_dummyaudio.h"
/* !!! FIXME: add a dummy WaitDevice to simulate real audio better? */
/* !!! FIXME: this should be an SDL hint, not an environment variable. */
#define DUMMYENVR_IODELAY "SDL_DUMMYAUDIODELAY"
static void DUMMYAUDIO_WaitDevice(SDL_AudioDevice *device)
{
SDL_Delay(device->hidden->io_delay);
}
static int DUMMYAUDIO_OpenDevice(SDL_AudioDevice *device)
{
device->hidden = (struct SDL_PrivateAudioData *) SDL_malloc(device->buffer_size);
const char *envr = SDL_getenv(DUMMYENVR_IODELAY);
device->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, sizeof(*device->hidden));
if (!device->hidden) {
return SDL_OutOfMemory();
}
return 0; /* don't change reported device format. */
if (!device->iscapture) {
device->hidden->mixbuf = (Uint8 *) SDL_malloc(device->buffer_size);
if (!device->hidden->mixbuf) {
return SDL_OutOfMemory();
}
}
device->hidden->io_delay = envr ? SDL_atoi(envr) : ((device->sample_frames * 1000) / device->spec.freq);
return 0; /* we're good; don't change reported device format. */
}
static void DUMMYAUDIO_CloseDevice(SDL_AudioDevice *device)
{
if (device->hidden) {
SDL_free(device->hidden->mixbuf);
SDL_free(device->hidden);
device->hidden = NULL;
}
}
static Uint8 *DUMMYAUDIO_GetDeviceBuf(SDL_AudioDevice *device, int *buffer_size)
{
return (Uint8 *) device->hidden;
return device->hidden->mixbuf;
}
static int DUMMYAUDIO_CaptureFromDevice(SDL_AudioDevice *device, void *buffer, int buflen)
{
/* Delay to make this sort of simulate real audio input. */
SDL_Delay((device->sample_frames * 1000) / device->spec.freq);
/* always return a full buffer of silence. */
SDL_memset(buffer, device->silence_value, buflen);
return buflen;
@ -59,17 +77,18 @@ static int DUMMYAUDIO_CaptureFromDevice(SDL_AudioDevice *device, void *buffer, i
static SDL_bool DUMMYAUDIO_Init(SDL_AudioDriverImpl *impl)
{
/* Set the function pointers */
impl->OpenDevice = DUMMYAUDIO_OpenDevice;
impl->CloseDevice = DUMMYAUDIO_CloseDevice;
impl->WaitDevice = DUMMYAUDIO_WaitDevice;
impl->GetDeviceBuf = DUMMYAUDIO_GetDeviceBuf;
impl->WaitCaptureDevice = DUMMYAUDIO_WaitDevice;
impl->CaptureFromDevice = DUMMYAUDIO_CaptureFromDevice;
impl->OnlyHasDefaultOutputDevice = SDL_TRUE;
impl->OnlyHasDefaultCaptureDevice = SDL_TRUE;
impl->HasCaptureSupport = SDL_TRUE;
return SDL_TRUE; /* this audio target is available. */
return SDL_TRUE;
}
AudioBootStrap DUMMYAUDIO_bootstrap = {

6
src/audio/dummy/SDL_dummyaudio.h
View File

@ -25,15 +25,11 @@
#include "../SDL_sysaudio.h"
/* !!! FIXME: none of this is actually used. Dump this whole file. */
struct SDL_PrivateAudioData
{
/* The file descriptor for the audio device */
Uint8 *mixbuf;
Uint32 mixlen;
Uint32 write_delay;
Uint32 initial_calls;
Uint32 io_delay;
};
#endif /* SDL_dummyaudio_h_ */