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/*
* SDL_sound Decoder Helpers
*
* Copyright (c) 2013 by Chris Robinson <chris.kcat@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/* This file contains routines for helping to decode audio using SDL_sound.
* There's very little OpenAL-specific code here.
*/
#include "sdl_sound.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <signal.h>
#include <assert.h>
#include <SDL_sound.h>
#include "AL/al.h"
#include "AL/alc.h"
#include "AL/alext.h"
#include "alhelpers.h"
static int done_init = 0;
FilePtr openAudioFile(const char *fname, size_t buftime_ms)
{
FilePtr file;
ALuint rate;
Uint32 bufsize;
ALenum chans, type;
/* We need to make sure SDL_sound is initialized. */
if(!done_init)
{
Sound_Init();
done_init = 1;
}
file = Sound_NewSampleFromFile(fname, NULL, 0);
if(!file)
{
fprintf(stderr, "Failed to open %s: %s\n", fname, Sound_GetError());
return NULL;
}
if(getAudioInfo(file, &rate, &chans, &type) != 0)
{
Sound_FreeSample(file);
return NULL;
}
bufsize = FramesToBytes((ALsizei)(buftime_ms/1000.0*rate), chans, type);
if(Sound_SetBufferSize(file, bufsize) == 0)
{
fprintf(stderr, "Failed to set buffer size to %u bytes: %s\n", bufsize, Sound_GetError());
Sound_FreeSample(file);
return NULL;
}
return file;
}
void closeAudioFile(FilePtr file)
{
if(file)
Sound_FreeSample(file);
}
int getAudioInfo(FilePtr file, ALuint *rate, ALenum *channels, ALenum *type)
{
if(file->actual.channels == 1)
*channels = AL_MONO_SOFT;
else if(file->actual.channels == 2)
*channels = AL_STEREO_SOFT;
else
{
fprintf(stderr, "Unsupported channel count: %d\n", file->actual.channels);
return 1;
}
if(file->actual.format == AUDIO_U8)
*type = AL_UNSIGNED_BYTE_SOFT;
else if(file->actual.format == AUDIO_S8)
*type = AL_BYTE_SOFT;
else if(file->actual.format == AUDIO_U16LSB || file->actual.format == AUDIO_U16MSB)
*type = AL_UNSIGNED_SHORT_SOFT;
else if(file->actual.format == AUDIO_S16LSB || file->actual.format == AUDIO_S16MSB)
*type = AL_SHORT_SOFT;
else
{
fprintf(stderr, "Unsupported sample format: 0x%04x\n", file->actual.format);
return 1;
}
*rate = file->actual.rate;
return 0;
}
uint8_t *getAudioData(FilePtr file, size_t *length)
{
*length = Sound_Decode(file);
if(*length == 0)
return NULL;
if((file->actual.format == AUDIO_U16LSB && AUDIO_U16LSB != AUDIO_U16SYS) ||
(file->actual.format == AUDIO_U16MSB && AUDIO_U16MSB != AUDIO_U16SYS) ||
(file->actual.format == AUDIO_S16LSB && AUDIO_S16LSB != AUDIO_S16SYS) ||
(file->actual.format == AUDIO_S16MSB && AUDIO_S16MSB != AUDIO_S16SYS))
{
/* Swap bytes if the decoded endianness doesn't match the system. */
char *buffer = file->buffer;
size_t i;
for(i = 0;i < *length;i+=2)
{
char b = buffer[i];
buffer[i] = buffer[i+1];
buffer[i+1] = b;
}
}
return file->buffer;
}
void *decodeAudioStream(FilePtr file, size_t *length)
{
Uint32 got;
char *mem;
got = Sound_DecodeAll(file);
if(got == 0)
{
*length = 0;
return NULL;
}
mem = malloc(got);
memcpy(mem, file->buffer, got);
*length = got;
return mem;
}
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