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AuroraOpenALSoft/Alc/wave.c

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/**
* OpenAL cross platform audio library
* Copyright (C) 1999-2007 by authors.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include "alMain.h"
#include "AL/al.h"
#include "AL/alc.h"
typedef struct {
FILE *f;
long DataStart;
ALvoid *buffer;
ALuint size;
volatile int killNow;
ALvoid *thread;
} wave_data;
static const ALCchar waveDevice[] = "Wave File Writer";
static ALuint WaveProc(ALvoid *ptr)
{
ALCdevice *pDevice = (ALCdevice*)ptr;
wave_data *data = (wave_data*)pDevice->ExtraData;
ALuint frameSize;
ALuint now, last;
size_t WriteCnt;
size_t fs;
ALuint avail;
union {
short s;
char b[sizeof(short)];
} uSB;
uSB.s = 1;
frameSize = aluBytesFromFormat(pDevice->Format) *
aluChannelsFromFormat(pDevice->Format);
last = timeGetTime();
while(!data->killNow)
{
now = timeGetTime();
avail = (now-last) * pDevice->Frequency / 1000;
if(avail < pDevice->UpdateSize)
{
Sleep(1);
continue;
}
while(avail > 0)
{
SuspendContext(NULL);
WriteCnt = min(data->size, avail);
aluMixData(pDevice->Context, data->buffer, WriteCnt * frameSize,
pDevice->Format);
ProcessContext(NULL);
if(uSB.b[0] != 1 && aluBytesFromFormat(pDevice->Format) > 1)
{
ALubyte *bytes = data->buffer;
ALuint i;
for(i = 0;i < WriteCnt*frameSize;i++)
fputc(bytes[i^1], data->f);
}
else
fs = fwrite(data->buffer, frameSize, WriteCnt, data->f);
if(ferror(data->f))
{
AL_PRINT("Error writing to file\n");
data->killNow = 1;
break;
}
avail -= WriteCnt;
}
last = now;
}
return 0;
}
static ALCboolean wave_open_playback(ALCdevice *device, const ALCchar *deviceName)
{
wave_data *data;
const char *fname;
fname = GetConfigValue("wave", "file", "");
if(!fname[0])
return ALC_FALSE;
if(deviceName)
{
if(strcmp(deviceName, waveDevice) != 0)
return ALC_FALSE;
device->szDeviceName = waveDevice;
}
else
device->szDeviceName = waveDevice;
data = (wave_data*)calloc(1, sizeof(wave_data));
data->f = fopen(fname, "wb");
if(!data->f)
{
free(data);
AL_PRINT("Could not open file '%s': %s\n", fname, strerror(errno));
return ALC_FALSE;
}
device->ExtraData = data;
return ALC_TRUE;
}
static void wave_close_playback(ALCdevice *device)
{
wave_data *data = (wave_data*)device->ExtraData;
ALuint dataLen;
long size;
data->killNow = 1;
StopThread(data->thread);
size = ftell(data->f);
if(size > 0)
{
dataLen = size - data->DataStart;
if(fseek(data->f, data->DataStart-4, SEEK_SET) == 0)
{
fputc(dataLen&0xff, data->f); // 'data' header len
fputc((dataLen>>8)&0xff, data->f);
fputc((dataLen>>16)&0xff, data->f);
fputc((dataLen>>24)&0xff, data->f);
}
if(fseek(data->f, 4, SEEK_SET) == 0)
{
size -= 8;
fputc(size&0xff, data->f); // 'WAVE' header len
fputc((size>>8)&0xff, data->f);
fputc((size>>16)&0xff, data->f);
fputc((size>>24)&0xff, data->f);
}
}
fclose(data->f);
free(data);
device->ExtraData = NULL;
}
static ALCboolean wave_start_context(ALCdevice *device, ALCcontext *Context)
{
wave_data *data = (wave_data*)device->ExtraData;
ALuint channels, bits, i;
(void)Context;
fseek(data->f, 0, SEEK_SET);
clearerr(data->f);
bits = aluBytesFromFormat(device->Format) * 8;
channels = aluChannelsFromFormat(device->Format);
switch(bits)
{
case 8:
case 16:
case 32:
if(channels == 0)
{
AL_PRINT("Unknown format?! %x\n", device->Format);
return ALC_FALSE;
}
break;
default:
AL_PRINT("Unknown format?! %x\n", device->Format);
return ALC_FALSE;
}
fprintf(data->f, "RIFF");
fputc(0, data->f); // 'RIFF' header len; filled in at close
fputc(0, data->f);
fputc(0, data->f);
fputc(0, data->f);
fprintf(data->f, "WAVE");
fprintf(data->f, "fmt ");
fputc(16, data->f); // 'fmt ' header len; 16 bytes for PCM
fputc(0, data->f);
fputc(0, data->f);
fputc(0, data->f);
// 16-bit val, format type id (PCM: 1)
fputc(1, data->f);
fputc(0, data->f);
// 16-bit val, channel count
fputc(channels&0xff, data->f);
fputc((channels>>8)&0xff, data->f);
// 32-bit val, frequency
fputc(device->Frequency&0xff, data->f);
fputc((device->Frequency>>8)&0xff, data->f);
fputc((device->Frequency>>16)&0xff, data->f);
fputc((device->Frequency>>24)&0xff, data->f);
// 32-bit val, bytes per second
i = device->Frequency * channels * bits / 8;
fputc(i&0xff, data->f);
fputc((i>>8)&0xff, data->f);
fputc((i>>16)&0xff, data->f);
fputc((i>>24)&0xff, data->f);
// 16-bit val, frame size
i = channels * bits / 8;
fputc(i&0xff, data->f);
fputc((i>>8)&0xff, data->f);
// 16-bit val, bits per sample
fputc(bits&0xff, data->f);
fputc((bits>>8)&0xff, data->f);
fprintf(data->f, "data");
fputc(0, data->f); // 'data' header len; filled in at close
fputc(0, data->f);
fputc(0, data->f);
fputc(0, data->f);
if(ferror(data->f))
{
AL_PRINT("Error writing header: %s\n", strerror(errno));
return ALC_FALSE;
}
data->DataStart = ftell(data->f);
device->UpdateSize = device->BufferSize / 4;
data->size = device->UpdateSize;
data->buffer = malloc(data->size * channels * bits / 8);
if(!data->buffer)
{
AL_PRINT("buffer malloc failed\n");
return ALC_FALSE;
}
data->thread = StartThread(WaveProc, device);
if(data->thread == NULL)
{
free(data->buffer);
data->buffer = NULL;
return ALC_FALSE;
}
return ALC_TRUE;
}
static void wave_stop_context(ALCdevice *device, ALCcontext *Context)
{
wave_data *data = (wave_data*)device->ExtraData;
ALuint dataLen;
long size;
(void)Context;
if(!data->thread)
return;
data->killNow = 1;
StopThread(data->thread);
data->thread = NULL;
free(data->buffer);
data->buffer = NULL;
size = ftell(data->f);
if(size > 0)
{
dataLen = size - data->DataStart;
if(fseek(data->f, data->DataStart-4, SEEK_SET) == 0)
{
fputc(dataLen&0xff, data->f); // 'data' header len
fputc((dataLen>>8)&0xff, data->f);
fputc((dataLen>>16)&0xff, data->f);
fputc((dataLen>>24)&0xff, data->f);
}
if(fseek(data->f, 4, SEEK_SET) == 0)
{
size -= 8;
fputc(size&0xff, data->f); // 'WAVE' header len
fputc((size>>8)&0xff, data->f);
fputc((size>>16)&0xff, data->f);
fputc((size>>24)&0xff, data->f);
}
}
}
static ALCboolean wave_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
{
(void)pDevice;
(void)deviceName;
return ALC_FALSE;
}
static void wave_close_capture(ALCdevice *pDevice)
{
(void)pDevice;
}
static void wave_start_capture(ALCdevice *pDevice)
{
(void)pDevice;
}
static void wave_stop_capture(ALCdevice *pDevice)
{
(void)pDevice;
}
static void wave_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
{
(void)pDevice;
(void)pBuffer;
(void)lSamples;
}
static ALCuint wave_available_samples(ALCdevice *pDevice)
{
(void)pDevice;
return 0;
}
BackendFuncs wave_funcs = {
wave_open_playback,
wave_close_playback,
wave_start_context,
wave_stop_context,
wave_open_capture,
wave_close_capture,
wave_start_capture,
wave_stop_capture,
wave_capture_samples,
wave_available_samples
};
void alc_wave_init(BackendFuncs *func_list)
{
*func_list = wave_funcs;
AppendDeviceList(waveDevice);
AppendAllDeviceList(waveDevice);
}
void alc_wave_deinit(void)
{
}
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