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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 "quakedef.h"
#include "qsound.h"
#include <SDL.h>
extern qbool ActiveApp, Minimized;
extern cvar_t sys_inactivesound;
static void Filler(void *userdata, Uint8 *stream, int len)
{
int size = shm->samples << 1;
int pos = shm->samplepos << 1;
int wrapped = pos + len - size;
// Implicit Minimized in first case
if (wrapped < 0) {
memcpy(stream, shm->buffer + pos, len);
shm->samplepos += len >> 1;
} else {
int remaining = size - pos;
memcpy(stream, shm->buffer + pos, remaining);
memcpy(stream + remaining, shm->buffer, wrapped);
shm->samplepos = wrapped >> 1;
}
if ((!sys_inactivesound.integer == 1 && !ActiveApp) || (sys_inactivesound.integer == 2 && Minimized))
{
SDL_memset(stream, 0, len);
}
}
void SNDDMA_Shutdown(void)
{
Con_Printf("Shutting down SDL audio.\n");
SDL_CloseAudio();
if (SDL_WasInit(SDL_INIT_AUDIO != 0))
SDL_QuitSubSystem(SDL_INIT_AUDIO);
if (shm->buffer) {
Q_free(shm->buffer);
shm->buffer = NULL;
}
}
qbool SNDDMA_Init(void)
{
SDL_AudioSpec desired, obtained;
int ret = 0;
if (SDL_WasInit(SDL_INIT_AUDIO) == 0)
ret = SDL_InitSubSystem(SDL_INIT_AUDIO);
if (ret == -1) {
Con_Printf("Couldn't initialize SDL audio: %s\n", SDL_GetError());
return false;
}
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 = 1024;
desired.channels = 2;
desired.callback = Filler;
ret = SDL_OpenAudio(&desired, &obtained);
if (ret == -1) {
Com_Printf("Couldn't open SDL audio: %s\n", SDL_GetError());
return false;
}
if (obtained.format != AUDIO_S16LSB) {
Com_Printf("SDL audio format %d unsupported.\n", obtained.format);
goto fail;
}
if (obtained.channels != 1 && obtained.channels != 2) {
Com_Printf("SDL audio channels %d unsupported.\n", obtained.channels);
goto fail;
}
shm->format.speed = obtained.freq;
shm->format.channels = obtained.channels;
shm->format.width = 2;
shm->samples = 0x4000 * obtained.channels;
shm->buffer = Q_malloc(shm->samples * 2);
shm->samplepos = 0;
shm->sampleframes = shm->samples / shm->format.channels;
Com_Printf("Using SDL audio driver: %s @ %d Hz\n", SDL_GetCurrentAudioDriver(), obtained.freq);
SDL_PauseAudio(0);
return true;
fail:
SNDDMA_Shutdown();
return false;
}
void SNDDMA_BeginPainting(void)
{
SDL_LockAudio();
}
void SNDDMA_Submit(void)
{
SDL_UnlockAudio();
}
int SNDDMA_GetDMAPos()
{
return shm->samplepos;
}
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