365 lines
9.2 KiB
C
365 lines
9.2 KiB
C
/**
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* OpenAL cross platform audio library
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* Copyright (C) 1999-2007 by authors.
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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* Or go to http://www.gnu.org/copyleft/lgpl.html
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <memory.h>
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#include "alMain.h"
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#include "AL/al.h"
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#include "AL/alc.h"
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typedef struct {
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FILE *f;
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long DataStart;
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ALvoid *buffer;
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ALuint size;
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volatile int killNow;
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ALvoid *thread;
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} wave_data;
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static const ALCchar waveDevice[] = "Wave File Writer";
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static const ALubyte SUBTYPE_PCM[] = {
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0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xaa,
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0x00, 0x38, 0x9b, 0x71
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};
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static const ALubyte SUBTYPE_FLOAT[] = {
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0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xaa,
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0x00, 0x38, 0x9b, 0x71
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};
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static const ALuint channel_masks[] = {
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0, /* invalid */
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0x4, /* Mono */
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0x1 | 0x2, /* Stereo */
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0, /* 3 channel */
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0x1 | 0x2 | 0x10 | 0x20, /* Quad */
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0, /* 5 channel */
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0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20, /* 5.1 */
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0x1 | 0x2 | 0x4 | 0x8 | 0x100 | 0x200 | 0x400, /* 6.1 */
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0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20 | 0x200 | 0x400, /* 7.1 */
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};
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static ALuint WaveProc(ALvoid *ptr)
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{
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ALCdevice *pDevice = (ALCdevice*)ptr;
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wave_data *data = (wave_data*)pDevice->ExtraData;
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ALuint frameSize;
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ALuint now, last;
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size_t fs;
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ALuint avail;
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union {
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short s;
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char b[sizeof(short)];
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} uSB;
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uSB.s = 1;
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frameSize = aluBytesFromFormat(pDevice->Format) *
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aluChannelsFromFormat(pDevice->Format);
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last = timeGetTime();
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while(!data->killNow && pDevice->Connected)
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{
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now = timeGetTime();
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avail = (now-last) * pDevice->Frequency / 1000;
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if(avail < pDevice->UpdateSize)
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{
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Sleep(1);
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continue;
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}
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while(avail >= pDevice->UpdateSize)
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{
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aluMixData(pDevice, data->buffer, pDevice->UpdateSize);
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if(uSB.b[0] != 1)
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{
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ALubyte *bytes = data->buffer;
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ALuint i;
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if(aluBytesFromFormat(pDevice->Format) == 2)
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{
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for(i = 0;i < data->size;i++)
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fputc(bytes[i^1], data->f);
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}
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else if(aluBytesFromFormat(pDevice->Format) == 4)
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{
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for(i = 0;i < data->size;i++)
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fputc(bytes[i^3], data->f);
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}
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}
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else
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fs = fwrite(data->buffer, frameSize, pDevice->UpdateSize,
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data->f);
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if(ferror(data->f))
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{
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AL_PRINT("Error writing to file\n");
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aluHandleDisconnect(pDevice);
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break;
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}
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avail -= pDevice->UpdateSize;
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}
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last = now;
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}
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return 0;
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}
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static ALCboolean wave_open_playback(ALCdevice *device, const ALCchar *deviceName)
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{
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wave_data *data;
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const char *fname;
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fname = GetConfigValue("wave", "file", "");
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if(!fname[0])
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return ALC_FALSE;
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if(!deviceName)
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deviceName = waveDevice;
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else if(strcmp(deviceName, waveDevice) != 0)
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return ALC_FALSE;
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data = (wave_data*)calloc(1, sizeof(wave_data));
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data->f = fopen(fname, "wb");
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if(!data->f)
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{
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free(data);
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AL_PRINT("Could not open file '%s': %s\n", fname, strerror(errno));
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return ALC_FALSE;
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}
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device->szDeviceName = strdup(deviceName);
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device->ExtraData = data;
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return ALC_TRUE;
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}
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static void wave_close_playback(ALCdevice *device)
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{
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wave_data *data = (wave_data*)device->ExtraData;
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fclose(data->f);
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free(data);
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device->ExtraData = NULL;
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}
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static ALCboolean wave_reset_playback(ALCdevice *device)
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{
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wave_data *data = (wave_data*)device->ExtraData;
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ALuint channels, bits, i;
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fseek(data->f, 0, SEEK_SET);
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clearerr(data->f);
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bits = aluBytesFromFormat(device->Format) * 8;
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channels = aluChannelsFromFormat(device->Format);
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/* 7.1 max */
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if(channels > 8)
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{
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if(bits == 8)
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device->Format = AL_FORMAT_71CHN8;
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else if(bits == 16)
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device->Format = AL_FORMAT_71CHN16;
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else
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{
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device->Format = AL_FORMAT_71CHN32;
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bits = 32;
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}
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channels = 8;
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}
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fprintf(data->f, "RIFF");
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fputc(0xFF, data->f); // 'RIFF' header len; filled in at close
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fputc(0xFF, data->f);
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fputc(0xFF, data->f);
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fputc(0xFF, data->f);
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fprintf(data->f, "WAVE");
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fprintf(data->f, "fmt ");
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fputc(40, data->f); // 'fmt ' header len; 40 bytes for EXTENSIVLE
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fputc(0, data->f);
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fputc(0, data->f);
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fputc(0, data->f);
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// 16-bit val, format type id (extensible: 0xFFFE)
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fputc(0xFE, data->f);
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fputc(0xFF, data->f);
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// 16-bit val, channel count
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fputc(channels&0xff, data->f);
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fputc((channels>>8)&0xff, data->f);
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// 32-bit val, frequency
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fputc(device->Frequency&0xff, data->f);
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fputc((device->Frequency>>8)&0xff, data->f);
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fputc((device->Frequency>>16)&0xff, data->f);
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fputc((device->Frequency>>24)&0xff, data->f);
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// 32-bit val, bytes per second
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i = device->Frequency * channels * bits / 8;
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fputc(i&0xff, data->f);
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fputc((i>>8)&0xff, data->f);
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fputc((i>>16)&0xff, data->f);
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fputc((i>>24)&0xff, data->f);
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// 16-bit val, frame size
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i = channels * bits / 8;
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fputc(i&0xff, data->f);
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fputc((i>>8)&0xff, data->f);
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// 16-bit val, bits per sample
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fputc(bits&0xff, data->f);
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fputc((bits>>8)&0xff, data->f);
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// 16-bit val, extra byte count
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fputc(22, data->f);
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fputc(0, data->f);
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// 16-bit val, valid bits per sample
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fputc(bits&0xff, data->f);
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fputc((bits>>8)&0xff, data->f);
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// 32-bit val, channel mask
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i = channel_masks[channels];
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fputc(i&0xff, data->f);
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fputc((i>>8)&0xff, data->f);
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fputc((i>>16)&0xff, data->f);
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fputc((i>>24)&0xff, data->f);
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// 16 byte GUID, sub-type format
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i = fwrite(((bits==32) ? SUBTYPE_FLOAT : SUBTYPE_PCM), 1, 16, data->f);
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fprintf(data->f, "data");
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fputc(0xFF, data->f); // 'data' header len; filled in at close
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fputc(0xFF, data->f);
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fputc(0xFF, data->f);
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fputc(0xFF, data->f);
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if(ferror(data->f))
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{
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AL_PRINT("Error writing header: %s\n", strerror(errno));
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return ALC_FALSE;
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}
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data->DataStart = ftell(data->f);
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data->size = device->UpdateSize * channels * bits / 8;
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data->buffer = malloc(data->size);
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if(!data->buffer)
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{
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AL_PRINT("buffer malloc failed\n");
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return ALC_FALSE;
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}
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SetDefaultWFXChannelOrder(device);
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data->thread = StartThread(WaveProc, device);
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if(data->thread == NULL)
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{
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free(data->buffer);
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data->buffer = NULL;
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return ALC_FALSE;
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}
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return ALC_TRUE;
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}
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static void wave_stop_playback(ALCdevice *device)
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{
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wave_data *data = (wave_data*)device->ExtraData;
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ALuint dataLen;
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long size;
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if(!data->thread)
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return;
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data->killNow = 1;
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StopThread(data->thread);
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data->thread = NULL;
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data->killNow = 0;
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free(data->buffer);
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data->buffer = NULL;
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size = ftell(data->f);
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if(size > 0)
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{
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dataLen = size - data->DataStart;
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if(fseek(data->f, data->DataStart-4, SEEK_SET) == 0)
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{
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fputc(dataLen&0xff, data->f); // 'data' header len
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fputc((dataLen>>8)&0xff, data->f);
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fputc((dataLen>>16)&0xff, data->f);
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fputc((dataLen>>24)&0xff, data->f);
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}
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if(fseek(data->f, 4, SEEK_SET) == 0)
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{
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size -= 8;
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fputc(size&0xff, data->f); // 'WAVE' header len
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fputc((size>>8)&0xff, data->f);
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fputc((size>>16)&0xff, data->f);
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fputc((size>>24)&0xff, data->f);
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}
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}
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}
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static ALCboolean wave_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
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{
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(void)pDevice;
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(void)deviceName;
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return ALC_FALSE;
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}
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BackendFuncs wave_funcs = {
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wave_open_playback,
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wave_close_playback,
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wave_reset_playback,
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wave_stop_playback,
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wave_open_capture,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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};
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void alc_wave_init(BackendFuncs *func_list)
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{
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*func_list = wave_funcs;
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}
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void alc_wave_deinit(void)
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{
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}
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void alc_wave_probe(int type)
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{
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if(!ConfigValueExists("wave", "file"))
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return;
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if(type == DEVICE_PROBE)
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AppendDeviceList(waveDevice);
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else if(type == ALL_DEVICE_PROBE)
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AppendAllDeviceList(waveDevice);
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}
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