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