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     volatile int killNow;
  39     ALvoid *thread;
  40 } wave_data;
  41
  42
  43 static const ALCchar waveDevice[] = "Wave File Writer";
  44
  45 static const ALubyte SUBTYPE_PCM[] = {
  46     0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xaa,
  47     0x00, 0x38, 0x9b, 0x71
  48 };
  49 static const ALubyte SUBTYPE_FLOAT[] = {
  50     0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x80, 0x00, 0x00, 0xaa,
  51     0x00, 0x38, 0x9b, 0x71
  52 };
  53
  54 static const ALuint channel_masks[] = {
  55     0, /* invalid */
  56     0x4, /* Mono */
  57     0x1 | 0x2, /* Stereo */
  58     0, /* 3 channel */
  59     0x1 | 0x2 | 0x10 | 0x20, /* Quad */
  60     0, /* 5 channel */
  61     0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20, /* 5.1 */
  62     0x1 | 0x2 | 0x4 | 0x8 | 0x100 | 0x200 | 0x400, /* 6.1 */
  63     0x1 | 0x2 | 0x4 | 0x8 | 0x10 | 0x20 | 0x200 | 0x400, /* 7.1 */
  64 };
  65
  66 static ALuint WaveProc(ALvoid *ptr)
  67 {
  68     ALCdevice *pDevice = (ALCdevice*)ptr;
  69     wave_data *data = (wave_data*)pDevice->ExtraData;
  70     ALuint frameSize;
  71     ALuint now, last;
  72     size_t fs;
  73     ALuint avail;
  74     union {
  75         short s;
  76         char b[sizeof(short)];
  77     } uSB;
  78
  79     uSB.s = 1;
  80     frameSize = aluFrameSizeFromFormat(pDevice->Format);
  81
  82     last = timeGetTime()<<8;
  83     while(!data->killNow && pDevice->Connected)
  84     {
  85         now = timeGetTime()<<8;
  86
  87         avail = (ALuint64)(now-last) * pDevice->Frequency / (1000<<8);
  88         if(avail < pDevice->UpdateSize)
  89         {
  90             Sleep(1);
  91             continue;
  92         }
  93
  94         while(avail >= pDevice->UpdateSize)
  95         {
  96             aluMixData(pDevice, data->buffer, pDevice->UpdateSize);
  97
  98             if(uSB.b[0] != 1)
  99             {
 100                 ALubyte *bytes = data->buffer;
 101                 ALuint i;
 102
 103                 if(aluBytesFromFormat(pDevice->Format) == 1)
 104                 {
 105                     for(i = 0;i < data->size;i++)
 106                         fputc(bytes[i], data->f);
 107                 }
 108                 else if(aluBytesFromFormat(pDevice->Format) == 2)
 109                 {
 110                     for(i = 0;i < data->size;i++)
 111                         fputc(bytes[i^1], data->f);
 112                 }
 113                 else if(aluBytesFromFormat(pDevice->Format) == 4)
 114                 {
 115                     for(i = 0;i < data->size;i++)
 116                         fputc(bytes[i^3], data->f);
 117                 }
 118             }
 119             else
 120                 fs = fwrite(data->buffer, frameSize, pDevice->UpdateSize,
 121                             data->f);
 122             if(ferror(data->f))
 123             {
 124                 AL_PRINT("Error writing to file\n");
 125                 aluHandleDisconnect(pDevice);
 126                 break;
 127             }
 128
 129             avail -= pDevice->UpdateSize;
 130             last += (ALuint64)pDevice->UpdateSize * (1000<<8) / pDevice->Frequency;
 131         }
 132     }
 133
 134     return 0;
 135 }
 136
 137 static ALCboolean wave_open_playback(ALCdevice *device, const ALCchar *deviceName)
 138 {
 139     wave_data *data;
 140     const char *fname;
 141
 142     fname = GetConfigValue("wave", "file", "");
 143     if(!fname[0])
 144         return ALC_FALSE;
 145
 146     if(!deviceName)
 147         deviceName = waveDevice;
 148     else if(strcmp(deviceName, waveDevice) != 0)
 149         return ALC_FALSE;
 150
 151     data = (wave_data*)calloc(1, sizeof(wave_data));
 152
 153     data->f = fopen(fname, "wb");
 154     if(!data->f)
 155     {
 156         free(data);
 157         AL_PRINT("Could not open file '%s': %s\n", fname, strerror(errno));
 158         return ALC_FALSE;
 159     }
 160
 161     device->szDeviceName = strdup(deviceName);
 162     device->ExtraData = data;
 163     return ALC_TRUE;
 164 }
 165
 166 static void wave_close_playback(ALCdevice *device)
 167 {
 168     wave_data *data = (wave_data*)device->ExtraData;
 169
 170     fclose(data->f);
 171     free(data);
 172     device->ExtraData = NULL;
 173 }
 174
 175 static ALCboolean wave_reset_playback(ALCdevice *device)
 176 {
 177     wave_data *data = (wave_data*)device->ExtraData;
 178     ALuint channels, bits, i;
 179     size_t val;
 180
 181     fseek(data->f, 0, SEEK_SET);
 182     clearerr(data->f);
 183
 184     bits = aluBytesFromFormat(device->Format) * 8;
 185     channels = aluChannelsFromFormat(device->Format);
 186
 187     /* 7.1 max */
 188     if(channels > 8)
 189     {
 190         if(bits == 8)
 191             device->Format = AL_FORMAT_71CHN8;
 192         else if(bits == 16)
 193             device->Format = AL_FORMAT_71CHN16;
 194         else
 195         {
 196             device->Format = AL_FORMAT_71CHN32;
 197             bits = 32;
 198         }
 199         channels = 8;
 200     }
 201
 202     fprintf(data->f, "RIFF");
 203     fputc(0xFF, data->f); // 'RIFF' header len; filled in at close
 204     fputc(0xFF, data->f);
 205     fputc(0xFF, data->f);
 206     fputc(0xFF, data->f);
 207
 208     fprintf(data->f, "WAVE");
 209
 210     fprintf(data->f, "fmt ");
 211     fputc(40, data->f); // 'fmt ' header len; 40 bytes for EXTENSIBLE
 212     fputc(0, data->f);
 213     fputc(0, data->f);
 214     fputc(0, data->f);
 215     // 16-bit val, format type id (extensible: 0xFFFE)
 216     fputc(0xFE, data->f);
 217     fputc(0xFF, data->f);
 218     // 16-bit val, channel count
 219     fputc(channels&0xff, data->f);
 220     fputc((channels>>8)&0xff, data->f);
 221     // 32-bit val, frequency
 222     fputc(device->Frequency&0xff, data->f);
 223     fputc((device->Frequency>>8)&0xff, data->f);
 224     fputc((device->Frequency>>16)&0xff, data->f);
 225     fputc((device->Frequency>>24)&0xff, data->f);
 226     // 32-bit val, bytes per second
 227     i = device->Frequency * channels * bits / 8;
 228     fputc(i&0xff, data->f);
 229     fputc((i>>8)&0xff, data->f);
 230     fputc((i>>16)&0xff, data->f);
 231     fputc((i>>24)&0xff, data->f);
 232     // 16-bit val, frame size
 233     i = channels * bits / 8;
 234     fputc(i&0xff, data->f);
 235     fputc((i>>8)&0xff, data->f);
 236     // 16-bit val, bits per sample
 237     fputc(bits&0xff, data->f);
 238     fputc((bits>>8)&0xff, data->f);
 239     // 16-bit val, extra byte count
 240     fputc(22, data->f);
 241     fputc(0, data->f);
 242     // 16-bit val, valid bits per sample
 243     fputc(bits&0xff, data->f);
 244     fputc((bits>>8)&0xff, data->f);
 245     // 32-bit val, channel mask
 246     i = channel_masks[channels];
 247     fputc(i&0xff, data->f);
 248     fputc((i>>8)&0xff, data->f);
 249     fputc((i>>16)&0xff, data->f);
 250     fputc((i>>24)&0xff, data->f);
 251     // 16 byte GUID, sub-type format
 252     val = fwrite(((bits==32) ? SUBTYPE_FLOAT : SUBTYPE_PCM), 1, 16, data->f);
 253
 254     fprintf(data->f, "data");
 255     fputc(0xFF, data->f); // 'data' header len; filled in at close
 256     fputc(0xFF, data->f);
 257     fputc(0xFF, data->f);
 258     fputc(0xFF, data->f);
 259
 260     if(ferror(data->f))
 261     {
 262         AL_PRINT("Error writing header: %s\n", strerror(errno));
 263         return ALC_FALSE;
 264     }
 265
 266     data->DataStart = ftell(data->f);
 267
 268     data->size = device->UpdateSize * channels * bits / 8;
 269     data->buffer = malloc(data->size);
 270     if(!data->buffer)
 271     {
 272         AL_PRINT("buffer malloc failed\n");
 273         return ALC_FALSE;
 274     }
 275
 276     SetDefaultWFXChannelOrder(device);
 277
 278     data->thread = StartThread(WaveProc, device);
 279     if(data->thread == NULL)
 280     {
 281         free(data->buffer);
 282         data->buffer = NULL;
 283         return ALC_FALSE;
 284     }
 285
 286     return ALC_TRUE;
 287 }
 288
 289 static void wave_stop_playback(ALCdevice *device)
 290 {
 291     wave_data *data = (wave_data*)device->ExtraData;
 292     ALuint dataLen;
 293     long size;
 294
 295     if(!data->thread)
 296         return;
 297
 298     data->killNow = 1;
 299     StopThread(data->thread);
 300     data->thread = NULL;
 301
 302     data->killNow = 0;
 303
 304     free(data->buffer);
 305     data->buffer = NULL;
 306
 307     size = ftell(data->f);
 308     if(size > 0)
 309     {
 310         dataLen = size - data->DataStart;
 311         if(fseek(data->f, data->DataStart-4, SEEK_SET) == 0)
 312         {
 313             fputc(dataLen&0xff, data->f); // 'data' header len
 314             fputc((dataLen>>8)&0xff, data->f);
 315             fputc((dataLen>>16)&0xff, data->f);
 316             fputc((dataLen>>24)&0xff, data->f);
 317         }
 318         if(fseek(data->f, 4, SEEK_SET) == 0)
 319         {
 320             size -= 8;
 321             fputc(size&0xff, data->f); // 'WAVE' header len
 322             fputc((size>>8)&0xff, data->f);
 323             fputc((size>>16)&0xff, data->f);
 324             fputc((size>>24)&0xff, data->f);
 325         }
 326     }
 327 }
 328
 329
 330 static ALCboolean wave_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
 331 {
 332     (void)pDevice;
 333     (void)deviceName;
 334     return ALC_FALSE;
 335 }
 336
 337
 338 BackendFuncs wave_funcs = {
 339     wave_open_playback,
 340     wave_close_playback,
 341     wave_reset_playback,
 342     wave_stop_playback,
 343     wave_open_capture,
 344     NULL,
 345     NULL,
 346     NULL,
 347     NULL,
 348     NULL
 349 };
 350
 351 void alc_wave_init(BackendFuncs *func_list)
 352 {
 353     *func_list = wave_funcs;
 354 }
 355
 356 void alc_wave_deinit(void)
 357 {
 358 }
 359
 360 void alc_wave_probe(int type)
 361 {
 362     if(!ConfigValueExists("wave", "file"))
 363         return;
 364
 365     if(type == DEVICE_PROBE)
 366         AppendDeviceList(waveDevice);
 367     else if(type == ALL_DEVICE_PROBE)
 368         AppendAllDeviceList(waveDevice);
 369 }