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audio: First shot at the SDL3 audio subsystem redesign!

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This is a work in progress! (and this commit will probably get
force-pushed over at some point).
This commit is contained in:
Ryan C. Gordon
2023-05-12 23:37:02 -04:00
parent b221b59995
commit 905c4fff5b
19 changed files with 1974 additions and 2464 deletions
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31
src/audio/dummy/SDL_dummyaudio.c
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@@ -25,20 +25,35 @@
#include "../SDL_audio_c.h"
#include "SDL_dummyaudio.h"
static int DUMMYAUDIO_OpenDevice(SDL_AudioDevice *_this, const char *devname)
{
_this->hidden = (void *)0x1; /* just something non-NULL */
/* !!! FIXME: add a dummy WaitDevice to simulate real audio better? */
return 0; /* always succeeds. */
static int DUMMYAUDIO_OpenDevice(SDL_AudioDevice *device)
{
device->hidden = (struct SDL_PrivateAudioData *) SDL_malloc(device->buffer_size);
if (!device->hidden) {
return SDL_OutOfMemory();
}
return 0; /* don't change reported device format. */
}
static int DUMMYAUDIO_CaptureFromDevice(SDL_AudioDevice *_this, void *buffer, int buflen)
static void DUMMYAUDIO_CloseDevice(SDL_AudioDevice *device)
{
SDL_free(device->hidden);
device->hidden = NULL;
}
static Uint8 *DUMMYAUDIO_GetDeviceBuf(SDL_AudioDevice *device, int *buffer_size)
{
return (Uint8 *) device->hidden;
}
static int DUMMYAUDIO_CaptureFromDevice(SDL_AudioDevice *device, void *buffer, int buflen)
{
/* Delay to make this sort of simulate real audio input. */
SDL_Delay((_this->spec.samples * 1000) / _this->spec.freq);
SDL_Delay((device->sample_frames * 1000) / device->freq);
/* always return a full buffer of silence. */
SDL_memset(buffer, _this->spec.silence, buflen);
SDL_memset(buffer, device->silence_value, buflen);
return buflen;
}
@@ -46,6 +61,8 @@ static SDL_bool DUMMYAUDIO_Init(SDL_AudioDriverImpl *impl)
{
/* Set the function pointers */
impl->OpenDevice = DUMMYAUDIO_OpenDevice;
impl->CloseDevice = DUMMYAUDIO_CloseDevice;
impl->GetDeviceBuf = DUMMYAUDIO_GetDeviceBuf;
impl->CaptureFromDevice = DUMMYAUDIO_CaptureFromDevice;
impl->OnlyHasDefaultOutputDevice = SDL_TRUE;

2
src/audio/dummy/SDL_dummyaudio.h
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@@ -25,6 +25,8 @@
#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 */