Alc/wave.c

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  *  Boston, MA  02111-1307, USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <memory.h>
  26 #include "alMain.h"
  27 #include "AL/al.h"
  28 #include "AL/alc.h"
  29
  30
  31 typedef struct {
  32     FILE *f;
  33     long DataStart;
  34
  35     ALvoid *buffer;
  36     ALuint size;
  37
  38     int killNow;
  39     ALvoid *thread;
  40 } wave_data;
  41
  42
  43 static ALCchar *waveDevice;
  44
  45
  46 static ALuint WaveProc(ALvoid *ptr)
  47 {
  48     ALCdevice *pDevice = (ALCdevice*)ptr;
  49     wave_data *data = (wave_data*)pDevice->ExtraData;
  50     ALuint frameSize;
  51     ALuint now, last;
  52     size_t WriteCnt;
  53     ALuint avail;
  54     union {
  55         short s;
  56         char b[sizeof(short)];
  57     } uSB;
  58
  59     uSB.s = 1;
  60     frameSize = aluBytesFromFormat(pDevice->Format) *
  61                 aluChannelsFromFormat(pDevice->Format);
  62
  63     last = timeGetTime();
  64     while(!data->killNow)
  65     {
  66         now = timeGetTime();
  67
  68         avail = (now-last) * pDevice->Frequency / 1000;
  69         if(avail < pDevice->UpdateFreq/4)
  70         {
  71             Sleep(1);
  72             continue;
  73         }
  74
  75         while(avail > 0)
  76         {
  77             SuspendContext(NULL);
  78             WriteCnt = min(data->size, avail);
  79             aluMixData(pDevice->Context, data->buffer, WriteCnt * frameSize,
  80                        pDevice->Format);
  81             ProcessContext(NULL);
  82
  83             if(uSB.b[0] != 1 && aluBytesFromFormat(pDevice->Format) > 1)
  84             {
  85                 ALubyte *bytes = data->buffer;
  86                 ALuint i;
  87
  88                 for(i = 0;i < WriteCnt*frameSize;i++)
  89                     fputc(bytes[i^1], data->f);
  90             }
  91             else
  92                 fwrite(data->buffer, frameSize, WriteCnt, data->f);
  93             if(ferror(data->f))
  94             {
  95                 AL_PRINT("Error writing to file\n");
  96                 data->killNow = 1;
  97                 break;
  98             }
  99
 100             avail -= WriteCnt;
 101         }
 102         last = now;
 103     }
 104
 105     return 0;
 106 }
 107
 108 static ALCboolean wave_open_playback(ALCdevice *device, const ALCchar *deviceName)
 109 {
 110     wave_data *data;
 111     ALuint channels;
 112     ALuint bits;
 113     const char *fname;
 114     int i;
 115
 116     fname = GetConfigValue("wave", "file", "");
 117     if(!fname[0])
 118         return ALC_FALSE;
 119
 120     if(deviceName)
 121     {
 122         if(strcmp(deviceName, waveDevice) != 0)
 123             return ALC_FALSE;
 124         device->szDeviceName = waveDevice;
 125     }
 126     else
 127         device->szDeviceName = waveDevice;
 128
 129     data = (wave_data*)calloc(1, sizeof(wave_data));
 130
 131     data->f = fopen(fname, "wb");
 132     if(!data->f)
 133     {
 134         free(data);
 135         AL_PRINT("Could not open file '%s': %s\n", fname, strerror(errno));
 136         return ALC_FALSE;
 137     }
 138
 139     bits = aluBytesFromFormat(device->Format) * 8;
 140     channels = aluChannelsFromFormat(device->Format);
 141     switch(bits)
 142     {
 143         case 8:
 144         case 16:
 145             if(channels == 0)
 146             {
 147                 AL_PRINT("Unknown format?! %x\n", device->Format);
 148                 fclose(data->f);
 149                 free(data);
 150                 return ALC_FALSE;
 151             }
 152             break;
 153
 154         default:
 155             AL_PRINT("Unknown format?! %x\n", device->Format);
 156             fclose(data->f);
 157             free(data);
 158             return ALC_FALSE;
 159     }
 160
 161     fprintf(data->f, "RIFF");
 162     fputc(0, data->f); // 'RIFF' header len; filled in at close
 163     fputc(0, data->f);
 164     fputc(0, data->f);
 165     fputc(0, data->f);
 166
 167     fprintf(data->f, "WAVE");
 168
 169     fprintf(data->f, "fmt ");
 170     fputc(16, data->f); // 'fmt ' header len; 16 bytes for PCM
 171     fputc(0, data->f);
 172     fputc(0, data->f);
 173     fputc(0, data->f);
 174     // 16-bit val, format type id (PCM: 1)
 175     fputc(1, data->f);
 176     fputc(0, data->f);
 177     // 16-bit val, channel count
 178     fputc(channels&0xff, data->f);
 179     fputc((channels>>8)&0xff, data->f);
 180     // 32-bit val, frequency
 181     fputc(device->Frequency&0xff, data->f);
 182     fputc((device->Frequency>>8)&0xff, data->f);
 183     fputc((device->Frequency>>16)&0xff, data->f);
 184     fputc((device->Frequency>>24)&0xff, data->f);
 185     // 32-bit val, bytes per second
 186     i = device->Frequency * channels * bits / 8;
 187     fputc(i&0xff, data->f);
 188     fputc((i>>8)&0xff, data->f);
 189     fputc((i>>16)&0xff, data->f);
 190     fputc((i>>24)&0xff, data->f);
 191     // 16-bit val, frame size
 192     i = channels * bits / 8;
 193     fputc(i&0xff, data->f);
 194     fputc((i>>8)&0xff, data->f);
 195     // 16-bit val, bits per sample
 196     fputc(bits&0xff, data->f);
 197     fputc((bits>>8)&0xff, data->f);
 198
 199     fprintf(data->f, "data");
 200     fputc(0, data->f); // 'data' header len; filled in at close
 201     fputc(0, data->f);
 202     fputc(0, data->f);
 203     fputc(0, data->f);
 204
 205     if(ferror(data->f))
 206     {
 207         AL_PRINT("Error writing header: %s\n", strerror(errno));
 208         fclose(data->f);
 209         free(data);
 210         return ALC_FALSE;
 211     }
 212
 213     data->DataStart = ftell(data->f);
 214
 215     device->UpdateFreq = max(device->UpdateFreq, 2048);
 216
 217     data->size = device->UpdateFreq;
 218     data->buffer = malloc(data->size * channels * bits / 8);
 219     if(!data->buffer)
 220     {
 221         AL_PRINT("buffer malloc failed\n");
 222         fclose(data->f);
 223         free(data);
 224         return ALC_FALSE;
 225     }
 226
 227     device->ExtraData = data;
 228     data->thread = StartThread(WaveProc, device);
 229     if(data->thread == NULL)
 230     {
 231         device->ExtraData = NULL;
 232         fclose(data->f);
 233         free(data->buffer);
 234         free(data);
 235         return ALC_FALSE;
 236     }
 237
 238     return ALC_TRUE;
 239 }
 240
 241 static void wave_close_playback(ALCdevice *device)
 242 {
 243     wave_data *data = (wave_data*)device->ExtraData;
 244     ALuint dataLen;
 245     long size;
 246
 247     data->killNow = 1;
 248     StopThread(data->thread);
 249
 250     size = ftell(data->f);
 251     if(size > 0)
 252     {
 253         dataLen = size - data->DataStart;
 254         if(fseek(data->f, data->DataStart-4, SEEK_SET) == 0)
 255         {
 256             fputc(dataLen&0xff, data->f); // 'data' header len
 257             fputc((dataLen>>8)&0xff, data->f);
 258             fputc((dataLen>>16)&0xff, data->f);
 259             fputc((dataLen>>24)&0xff, data->f);
 260         }
 261         if(fseek(data->f, 4, SEEK_SET) == 0)
 262         {
 263             size -= 8;
 264             fputc(size&0xff, data->f); // 'WAVE' header len
 265             fputc((size>>8)&0xff, data->f);
 266             fputc((size>>16)&0xff, data->f);
 267             fputc((size>>24)&0xff, data->f);
 268         }
 269     }
 270
 271     fclose(data->f);
 272     free(data->buffer);
 273     free(data);
 274     device->ExtraData = NULL;
 275 }
 276
 277
 278 static ALCboolean wave_open_capture(ALCdevice *pDevice, const ALCchar *deviceName, ALCuint frequency, ALCenum format, ALCsizei SampleSize)
 279 {
 280     (void)pDevice;
 281     (void)deviceName;
 282     (void)frequency;
 283     (void)format;
 284     (void)SampleSize;
 285     return ALC_FALSE;
 286 }
 287
 288 static void wave_close_capture(ALCdevice *pDevice)
 289 {
 290     (void)pDevice;
 291 }
 292
 293 static void wave_start_capture(ALCdevice *pDevice)
 294 {
 295     (void)pDevice;
 296 }
 297
 298 static void wave_stop_capture(ALCdevice *pDevice)
 299 {
 300     (void)pDevice;
 301 }
 302
 303 static void wave_capture_samples(ALCdevice *pDevice, ALCvoid *pBuffer, ALCuint lSamples)
 304 {
 305     (void)pDevice;
 306     (void)pBuffer;
 307     (void)lSamples;
 308 }
 309
 310 static ALCuint wave_available_samples(ALCdevice *pDevice)
 311 {
 312     (void)pDevice;
 313     return 0;
 314 }
 315
 316
 317 BackendFuncs wave_funcs = {
 318     wave_open_playback,
 319     wave_close_playback,
 320     wave_open_capture,
 321     wave_close_capture,
 322     wave_start_capture,
 323     wave_stop_capture,
 324     wave_capture_samples,
 325     wave_available_samples
 326 };
 327
 328 void alc_wave_init(BackendFuncs *func_list)
 329 {
 330     *func_list = wave_funcs;
 331
 332     waveDevice = AppendDeviceList("Wave File Writer");
 333     AppendAllDeviceList(waveDevice);
 334 }