openal-soft-1.13/Alc/wave.c

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2022-12-02 14:51:59 +08:00
/**
* 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 const ALubyte SUBTYPE_PCM[] = {
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xaa,
0x00, 0x38, 0x9b, 0x71
};
static const ALubyte SUBTYPE_FLOAT[] = {
0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xaa,
0x00, 0x38, 0x9b, 0x71
};
static const ALuint channel_masks[] = {
0, /* invalid */
0x4, /* Mono */
0x1 | 0x2, /* Stereo */
0, /* 3 channel */
0x1 | 0x2 | 0x10 | 0x20, /* Quad */
0, /* 5 channel */
0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20, /* 5.1 */
0x1 | 0x2 | 0x4 | 0x8 | 0x100 | 0x200 | 0x400, /* 6.1 */
0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20 | 0x200 | 0x400, /* 7.1 */
};
static void fwrite16le(ALushort val, FILE *f)
{
fputc(val&0xff, f);
fputc((val>>8)&0xff, f);
}
static void fwrite32le(ALuint val, FILE *f)
{
fputc(val&0xff, f);
fputc((val>>8)&0xff, f);
fputc((val>>16)&0xff, f);
fputc((val>>24)&0xff, f);
}
static ALuint WaveProc(ALvoid *ptr)
{
ALCdevice *pDevice = (ALCdevice*)ptr;
wave_data *data = (wave_data*)pDevice->ExtraData;
ALuint frameSize;
ALuint now, start;
ALuint64 avail, done;
size_t fs;
union {
short s;
char b[sizeof(short)];
} uSB;
const ALuint restTime = (ALuint64)pDevice->UpdateSize * 1000 /
pDevice->Frequency / 2;
uSB.s = 1;
frameSize = FrameSizeFromDevFmt(pDevice->FmtChans, pDevice->FmtType);
done = 0;
start = timeGetTime();
while(!data->killNow && pDevice->Connected)
{
now = timeGetTime();
avail = (ALuint64)(now-start) * pDevice->Frequency / 1000;
if(avail < done)
{
/* Timer wrapped. Add the remainder of the cycle to the available
* count and reset the number of samples done */
avail += (ALuint64)0xFFFFFFFFu*pDevice->Frequency/1000 - done;
done = 0;
}
if(avail-done < pDevice->UpdateSize)
{
Sleep(restTime);
continue;
}
while(avail-done >= pDevice->UpdateSize)
{
aluMixData(pDevice, data->buffer, pDevice->UpdateSize);
done += pDevice->UpdateSize;
if(uSB.b[0] != 1)
{
ALuint bytesize = BytesFromDevFmt(pDevice->FmtType);
ALubyte *bytes = data->buffer;
ALuint i;
if(bytesize == 1)
{
for(i = 0;i < data->size;i++)
fputc(bytes[i], data->f);
}
else if(bytesize == 2)
{
for(i = 0;i < data->size;i++)
fputc(bytes[i^1], data->f);
}
else if(bytesize == 4)
{
for(i = 0;i < data->size;i++)
fputc(bytes[i^3], data->f);
}
}
else
fs = fwrite(data->buffer, frameSize, pDevice->UpdateSize,
data->f);
if(ferror(data->f))
{
AL_PRINT("Error writing to file\n");
aluHandleDisconnect(pDevice);
break;
}
}
}
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)
deviceName = waveDevice;
else if(strcmp(deviceName, waveDevice) != 0)
return ALC_FALSE;
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->szDeviceName = strdup(deviceName);
device->ExtraData = data;
return ALC_TRUE;
}
static void wave_close_playback(ALCdevice *device)
{
wave_data *data = (wave_data*)device->ExtraData;
fclose(data->f);
free(data);
device->ExtraData = NULL;
}
static ALCboolean wave_reset_playback(ALCdevice *device)
{
wave_data *data = (wave_data*)device->ExtraData;
ALuint channels=0, bits=0;
size_t val;
fseek(data->f, 0, SEEK_SET);
clearerr(data->f);
switch(device->FmtType)
{
case DevFmtByte:
device->FmtType = DevFmtUByte;
break;
case DevFmtUShort:
device->FmtType = DevFmtShort;
break;
case DevFmtUByte:
case DevFmtShort:
case DevFmtFloat:
break;
}
bits = BytesFromDevFmt(device->FmtType) * 8;
channels = ChannelsFromDevFmt(device->FmtChans);
fprintf(data->f, "RIFF");
fwrite32le(0xFFFFFFFF, data->f); // 'RIFF' header len; filled in at close
fprintf(data->f, "WAVE");
fprintf(data->f, "fmt ");
fwrite32le(40, data->f); // 'fmt ' header len; 40 bytes for EXTENSIBLE
// 16-bit val, format type id (extensible: 0xFFFE)
fwrite16le(0xFFFE, data->f);
// 16-bit val, channel count
fwrite16le(channels, data->f);
// 32-bit val, frequency
fwrite32le(device->Frequency, data->f);
// 32-bit val, bytes per second
fwrite32le(device->Frequency * channels * bits / 8, data->f);
// 16-bit val, frame size
fwrite16le(channels * bits / 8, data->f);
// 16-bit val, bits per sample
fwrite16le(bits, data->f);
// 16-bit val, extra byte count
fwrite16le(22, data->f);
// 16-bit val, valid bits per sample
fwrite16le(bits, data->f);
// 32-bit val, channel mask
fwrite32le(channel_masks[channels], data->f);
// 16 byte GUID, sub-type format
val = fwrite(((bits==32) ? SUBTYPE_FLOAT : SUBTYPE_PCM), 1, 16, data->f);
fprintf(data->f, "data");
fwrite32le(0xFFFFFFFF, data->f); // 'data' header len; filled in at close
if(ferror(data->f))
{
AL_PRINT("Error writing header: %s\n", strerror(errno));
return ALC_FALSE;
}
data->DataStart = ftell(data->f);
data->size = device->UpdateSize * channels * bits / 8;
data->buffer = malloc(data->size);
if(!data->buffer)
{
AL_PRINT("buffer malloc failed\n");
return ALC_FALSE;
}
SetDefaultWFXChannelOrder(device);
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_playback(ALCdevice *device)
{
wave_data *data = (wave_data*)device->ExtraData;
ALuint dataLen;
long size;
if(!data->thread)
return;
data->killNow = 1;
StopThread(data->thread);
data->thread = NULL;
data->killNow = 0;
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)
fwrite32le(dataLen, data->f); // 'data' header len
if(fseek(data->f, 4, SEEK_SET) == 0)
fwrite32le(size-8, data->f); // 'WAVE' header len
}
}
static ALCboolean wave_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
{
(void)pDevice;
(void)deviceName;
return ALC_FALSE;
}
BackendFuncs wave_funcs = {
wave_open_playback,
wave_close_playback,
wave_reset_playback,
wave_stop_playback,
wave_open_capture,
NULL,
NULL,
NULL,
NULL,
NULL
};
void alc_wave_init(BackendFuncs *func_list)
{
*func_list = wave_funcs;
}
void alc_wave_deinit(void)
{
}
void alc_wave_probe(int type)
{
if(!ConfigValueExists("wave", "file"))
return;
if(type == DEVICE_PROBE)
AppendDeviceList(waveDevice);
else if(type == ALL_DEVICE_PROBE)
AppendAllDeviceList(waveDevice);
}