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/*
Copyright (C) 2007-2008 Andrey Nazarov
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
//
// snd_sdl.c
//
#include "shared/shared.h"
#include "common/zone.h"
#include "client/sound/dma.h"
#include <SDL.h>
static void Filler(void *userdata, Uint8 *stream, int len)
{
int size = dma.samples << 1;
int pos = dma.samplepos << 1;
int wrapped = pos + len - size;
if (wrapped < 0) {
memcpy(stream, dma.buffer + pos, len);
dma.samplepos += len >> 1;
} else {
int remaining = size - pos;
memcpy(stream, dma.buffer + pos, remaining);
memcpy(stream + remaining, dma.buffer, wrapped);
dma.samplepos = wrapped >> 1;
}
}
static void Shutdown(void)
{
Com_Printf("Shutting down SDL audio.\n");
SDL_CloseAudio();
if (SDL_WasInit(SDL_INIT_EVERYTHING) == SDL_INIT_AUDIO) {
SDL_Quit();
} else {
SDL_QuitSubSystem(SDL_INIT_AUDIO);
}
if (dma.buffer) {
Z_Free(dma.buffer);
dma.buffer = NULL;
}
}
static sndinitstat_t Init(void)
{
SDL_AudioSpec desired, obtained;
int ret;
if (SDL_WasInit(SDL_INIT_EVERYTHING) == 0) {
ret = SDL_Init(SDL_INIT_AUDIO);
} else {
ret = SDL_InitSubSystem(SDL_INIT_AUDIO);
}
if (ret == -1) {
Com_EPrintf("Couldn't initialize SDL audio: %s\n", SDL_GetError());
return SIS_FAILURE;
}
memset(&desired, 0, sizeof(desired));
switch (s_khz->integer) {
case 48:
desired.freq = 48000;
break;
case 44:
desired.freq = 44100;
break;
case 22:
desired.freq = 22050;
break;
default:
desired.freq = 11025;
break;
}
desired.format = AUDIO_S16LSB;
desired.samples = 512;
desired.channels = 2;
desired.callback = Filler;
ret = SDL_OpenAudio(&desired, &obtained);
if (ret == -1) {
Com_EPrintf("Couldn't open SDL audio: %s\n", SDL_GetError());
return SIS_FAILURE;
}
if (obtained.format != AUDIO_S16LSB) {
Com_EPrintf("SDL audio format %d unsupported.\n", obtained.format);
goto fail;
}
if (obtained.channels != 1 && obtained.channels != 2) {
Com_EPrintf("SDL audio channels %d unsupported.\n", obtained.channels);
goto fail;
}
dma.speed = obtained.freq;
dma.channels = obtained.channels;
dma.samples = 0x8000 * obtained.channels;
dma.submission_chunk = 1;
dma.samplebits = 16;
dma.buffer = Z_Mallocz(dma.samples * 2);
dma.samplepos = 0;
Com_Printf("Using SDL audio driver: %s\n", SDL_GetCurrentAudioDriver());
SDL_PauseAudio(0);
return SIS_SUCCESS;
fail:
Shutdown();
return SIS_FAILURE;
}
static void BeginPainting(void)
{
SDL_LockAudio();
}
static void Submit(void)
{
SDL_UnlockAudio();
}
static void Activate(qboolean active)
{
if (active) {
SDL_PauseAudio(0);
} else {
SDL_PauseAudio(1);
}
}
void WAVE_FillAPI(snddmaAPI_t *api)
{
api->Init = Init;
api->Shutdown = Shutdown;
api->BeginPainting = BeginPainting;
api->Submit = Submit;
api->Activate = Activate;
}
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