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/*
* snd_sdl.c - SDL audio driver for Hexen II: Hammer of Thyrion (uHexen2)
* based on implementations found in the quakeforge and ioquake3 projects.
*
* Copyright (C) 1999-2005 Id Software, Inc.
* Copyright (C) 2005-2012 O.Sezer <sezero@users.sourceforge.net>
* Copyright (C) 2010-2014 QuakeSpasm developers
*
* 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 lat er 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
*/
#include "quakedef.h"
#if defined(SDL_FRAMEWORK) || defined(NO_SDL_CONFIG)
#if defined(USE_SDL2)
#include <SDL2/SDL.h>
#else
#include <SDL/SDL.h>
#endif
#else
#include "SDL.h"
#endif
static int buffersize;
static void SDLCALL paint_audio (void *unused, Uint8 *stream, int len)
{
int pos, tobufend;
int len1, len2;
if (!shm)
{ /* shouldn't happen, but just in case */
memset(stream, 0, len);
return;
}
pos = (shm->samplepos * (shm->samplebits / 8));
if (pos >= buffersize)
shm->samplepos = pos = 0;
tobufend = buffersize - pos; /* bytes to buffer's end. */
len1 = len;
len2 = 0;
if (len1 > tobufend)
{
len1 = tobufend;
len2 = len - len1;
}
memcpy(stream, shm->buffer + pos, len1);
if (len2 <= 0)
{
shm->samplepos += (len1 / (shm->samplebits / 8));
}
else
{ /* wraparound? */
memcpy(stream + len1, shm->buffer, len2);
shm->samplepos = (len2 / (shm->samplebits / 8));
}
if (shm->samplepos >= buffersize)
shm->samplepos = 0;
}
qboolean SNDDMA_Init (dma_t *dma)
{
SDL_AudioSpec desired;
int tmp, val;
char drivername[128];
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0)
{
Con_Printf("Couldn't init SDL audio: %s\n", SDL_GetError());
return false;
}
/* Set up the desired format */
/* desired.freq = snd_mixspeed.value;*/
desired.freq = 44100;
desired.format = (loadas8bit.value) ? AUDIO_U8 : AUDIO_S16SYS;
desired.channels = 2; /* = desired_channels; */
if (desired.freq <= 11025)
desired.samples = 256;
else if (desired.freq <= 22050)
desired.samples = 512;
else if (desired.freq <= 44100)
desired.samples = 1024;
else if (desired.freq <= 56000)
desired.samples = 2048; /* for 48 kHz */
else
desired.samples = 4096; /* for 96 kHz */
desired.callback = paint_audio;
desired.userdata = NULL;
/* Open the audio device */
if (SDL_OpenAudio(&desired, NULL) == -1)
{
Con_Printf("Couldn't open SDL audio: %s\n", SDL_GetError());
SDL_QuitSubSystem(SDL_INIT_AUDIO);
return false;
}
/* i think i'm just zeroing dma mem here */
memset ((void *) dma, 0, sizeof(dma_t));
/*shm = dma;*/
shm = &sn;
/* Fill the audio DMA information block */
/* Since we passed NULL as the 'obtained' spec to SDL_OpenAudio(),
* SDL will convert to hardware format for us if needed, hence we
* directly use the desired values here. */
shm->samplebits = (desired.format & 0xFF); /* first byte of format is bits */
/* shm->signed8 = (desired.format == AUDIO_S8);*/
shm->speed = desired.freq;
shm->channels = desired.channels;
tmp = (desired.samples * desired.channels) * 10;
if (tmp & (tmp - 1))
{ /* make it a power of two */
val = 1;
while (val < tmp)
val <<= 1;
tmp = val;
}
shm->samples = tmp;
shm->samplepos = 0;
shm->submission_chunk = 1;
Con_Printf ("SDL audio spec : %d Hz, %d samples, %d channels\n",
desired.freq, desired.samples, desired.channels);
#if defined(USE_SDL2)
{
const char *driver = SDL_GetCurrentAudioDriver();
const char *device = SDL_GetAudioDeviceName(0, SDL_FALSE);
snprintf(drivername, sizeof(drivername), "%s - %s",
driver != NULL ? driver : "(UNKNOWN)",
device != NULL ? device : "(UNKNOWN)");
}
#else
if (SDL_AudioDriverName(drivername, sizeof(drivername)) == NULL)
strcpy(drivername, "(UNKNOWN)");
#endif
buffersize = shm->samples * (shm->samplebits / 8);
Con_Printf ("SDL audio driver: %s, %d bytes buffer\n", drivername, buffersize);
shm->buffer = (unsigned char *) calloc (1, buffersize);
// if (!shm->buffer)
if (!shm->buffer || shm->buffer == (unsigned char *)-1)
{
SDL_CloseAudio();
SDL_QuitSubSystem(SDL_INIT_AUDIO);
shm = NULL;
Con_Printf ("Failed allocating memory for SDL audio\n");
return false;
}
SDL_PauseAudio(0);
return true;
}
int SNDDMA_GetDMAPos (void)
{
return shm->samplepos;
}
void SNDDMA_Shutdown (void)
{
if (shm)
{
Con_Printf ("Shutting down SDL sound\n");
SDL_CloseAudio();
SDL_QuitSubSystem(SDL_INIT_AUDIO);
if (shm->buffer)
free (shm->buffer);
shm->buffer = NULL;
shm = NULL;
}
}
void SNDDMA_LockBuffer (void)
{
SDL_LockAudio ();
}
void SNDDMA_Submit (void)
{
SDL_UnlockAudio();
}
void SNDDMA_BlockSound (void)
{
SDL_PauseAudio(1);
}
void SNDDMA_UnblockSound (void)
{
SDL_PauseAudio(0);
}
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