examples/alrecord.c

   1 /*
   2  * OpenAL Recording Example
   3  *
   4  * Copyright (c) 2017 by Chris Robinson <chris.kcat@gmail.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /* This file contains a relatively simple recorder. */
  26
  27 #include <string.h>
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <errno.h>
  31
  32 #include "AL/al.h"
  33 #include "AL/alc.h"
  34 #include "AL/alext.h"
  35
  36 #include "common/alhelpers.h"
  37
  38 #include "win_main_utf8.h"
  39
  40
  41 #if defined(_WIN64)
  42 #define SZFMT "%I64u"
  43 #elif defined(_WIN32)
  44 #define SZFMT "%u"
  45 #else
  46 #define SZFMT "%zu"
  47 #endif
  48
  49
  50 #if defined(_MSC_VER) && (_MSC_VER < 1900)
  51 static float msvc_strtof(const char *str, char **end)
  52 { return (float)strtod(str, end); }
  53 #define strtof msvc_strtof
  54 #endif
  55
  56
  57 static void fwrite16le(ALushort val, FILE *f)
  58 {
  59     ALubyte data[2];
  60     data[0] = (ALubyte)(val&0xff);
  61     data[1] = (ALubyte)(val>>8);
  62     fwrite(data, 1, 2, f);
  63 }
  64
  65 static void fwrite32le(ALuint val, FILE *f)
  66 {
  67     ALubyte data[4];
  68     data[0] = (ALubyte)(val&0xff);
  69     data[1] = (ALubyte)((val>>8)&0xff);
  70     data[2] = (ALubyte)((val>>16)&0xff);
  71     data[3] = (ALubyte)(val>>24);
  72     fwrite(data, 1, 4, f);
  73 }
  74
  75
  76 typedef struct Recorder {
  77     ALCdevice *mDevice;
  78
  79     FILE *mFile;
  80     long mDataSizeOffset;
  81     ALuint mDataSize;
  82     float mRecTime;
  83
  84     ALuint mChannels;
  85     ALuint mBits;
  86     ALuint mSampleRate;
  87     ALuint mFrameSize;
  88     ALbyte *mBuffer;
  89     ALsizei mBufferSize;
  90 } Recorder;
  91
  92 int main(int argc, char **argv)
  93 {
  94     static const char optlist[] =
  95 "    --channels/-c <channels>  Set channel count (1 or 2)\n"
  96 "    --bits/-b <bits>          Set channel count (8, 16, or 32)\n"
  97 "    --rate/-r <rate>          Set sample rate (8000 to 96000)\n"
  98 "    --time/-t <time>          Time in seconds to record (1 to 10)\n"
  99 "    --outfile/-o <filename>   Output filename (default: record.wav)";
 100     const char *fname = "record.wav";
 101     const char *devname = NULL;
 102     const char *progname;
 103     Recorder recorder;
 104     long total_size;
 105     ALenum format;
 106     ALCenum err;
 107
 108     progname = argv[0];
 109     if(argc < 2)
 110     {
 111         fprintf(stderr, "Record from a device to a wav file.\n\n"
 112                 "Usage: %s [-device <name>] [options...]\n\n"
 113                 "Available options:\n%s\n", progname, optlist);
 114         return 0;
 115     }
 116
 117     recorder.mDevice = NULL;
 118     recorder.mFile = NULL;
 119     recorder.mDataSizeOffset = 0;
 120     recorder.mDataSize = 0;
 121     recorder.mRecTime = 4.0f;
 122     recorder.mChannels = 1;
 123     recorder.mBits = 16;
 124     recorder.mSampleRate = 44100;
 125     recorder.mFrameSize = recorder.mChannels * recorder.mBits / 8;
 126     recorder.mBuffer = NULL;
 127     recorder.mBufferSize = 0;
 128
 129     argv++; argc--;
 130     if(argc > 1 && strcmp(argv[0], "-device") == 0)
 131     {
 132         devname = argv[1];
 133         argv += 2;
 134         argc -= 2;
 135     }
 136
 137     while(argc > 0)
 138     {
 139         char *end;
 140         if(strcmp(argv[0], "--") == 0)
 141             break;
 142         else if(strcmp(argv[0], "--channels") == 0 || strcmp(argv[0], "-c") == 0)
 143         {
 144             if(argc < 2)
 145             {
 146                 fprintf(stderr, "Missing argument for option: %s\n", argv[0]);
 147                 return 1;
 148             }
 149
 150             recorder.mChannels = (ALuint)strtoul(argv[1], &end, 0);
 151             if((recorder.mChannels != 1 && recorder.mChannels != 2) || (end && *end != '\0'))
 152             {
 153                 fprintf(stderr, "Invalid channels: %s\n", argv[1]);
 154                 return 1;
 155             }
 156             argv += 2;
 157             argc -= 2;
 158         }
 159         else if(strcmp(argv[0], "--bits") == 0 || strcmp(argv[0], "-b") == 0)
 160         {
 161             if(argc < 2)
 162             {
 163                 fprintf(stderr, "Missing argument for option: %s\n", argv[0]);
 164                 return 1;
 165             }
 166
 167             recorder.mBits = (ALuint)strtoul(argv[1], &end, 0);
 168             if((recorder.mBits != 8 && recorder.mBits != 16 && recorder.mBits != 32) ||
 169                (end && *end != '\0'))
 170             {
 171                 fprintf(stderr, "Invalid bit count: %s\n", argv[1]);
 172                 return 1;
 173             }
 174             argv += 2;
 175             argc -= 2;
 176         }
 177         else if(strcmp(argv[0], "--rate") == 0 || strcmp(argv[0], "-r") == 0)
 178         {
 179             if(argc < 2)
 180             {
 181                 fprintf(stderr, "Missing argument for option: %s\n", argv[0]);
 182                 return 1;
 183             }
 184
 185             recorder.mSampleRate = (ALuint)strtoul(argv[1], &end, 0);
 186             if(!(recorder.mSampleRate >= 8000 && recorder.mSampleRate <= 96000) || (end && *end != '\0'))
 187             {
 188                 fprintf(stderr, "Invalid sample rate: %s\n", argv[1]);
 189                 return 1;
 190             }
 191             argv += 2;
 192             argc -= 2;
 193         }
 194         else if(strcmp(argv[0], "--time") == 0 || strcmp(argv[0], "-t") == 0)
 195         {
 196             if(argc < 2)
 197             {
 198                 fprintf(stderr, "Missing argument for option: %s\n", argv[0]);
 199                 return 1;
 200             }
 201
 202             recorder.mRecTime = strtof(argv[1], &end);
 203             if(!(recorder.mRecTime >= 1.0f && recorder.mRecTime <= 10.0f) || (end && *end != '\0'))
 204             {
 205                 fprintf(stderr, "Invalid record time: %s\n", argv[1]);
 206                 return 1;
 207             }
 208             argv += 2;
 209             argc -= 2;
 210         }
 211         else if(strcmp(argv[0], "--outfile") == 0 || strcmp(argv[0], "-o") == 0)
 212         {
 213             if(argc < 2)
 214             {
 215                 fprintf(stderr, "Missing argument for option: %s\n", argv[0]);
 216                 return 1;
 217             }
 218
 219             fname = argv[1];
 220             argv += 2;
 221             argc -= 2;
 222         }
 223         else if(strcmp(argv[0], "--help") == 0 || strcmp(argv[0], "-h") == 0)
 224         {
 225             fprintf(stderr, "Record from a device to a wav file.\n\n"
 226                     "Usage: %s [-device <name>] [options...]\n\n"
 227                     "Available options:\n%s\n", progname, optlist);
 228             return 0;
 229         }
 230         else
 231         {
 232             fprintf(stderr, "Invalid option '%s'.\n\n"
 233                     "Usage: %s [-device <name>] [options...]\n\n"
 234                     "Available options:\n%s\n", argv[0], progname, optlist);
 235             return 0;
 236         }
 237     }
 238
 239     recorder.mFrameSize = recorder.mChannels * recorder.mBits / 8;
 240
 241     format = AL_NONE;
 242     if(recorder.mChannels == 1)
 243     {
 244         if(recorder.mBits == 8)
 245             format = AL_FORMAT_MONO8;
 246         else if(recorder.mBits == 16)
 247             format = AL_FORMAT_MONO16;
 248         else if(recorder.mBits == 32)
 249             format = AL_FORMAT_MONO_FLOAT32;
 250     }
 251     else if(recorder.mChannels == 2)
 252     {
 253         if(recorder.mBits == 8)
 254             format = AL_FORMAT_STEREO8;
 255         else if(recorder.mBits == 16)
 256             format = AL_FORMAT_STEREO16;
 257         else if(recorder.mBits == 32)
 258             format = AL_FORMAT_STEREO_FLOAT32;
 259     }
 260
 261     recorder.mDevice = alcCaptureOpenDevice(devname, recorder.mSampleRate, format, 32768);
 262     if(!recorder.mDevice)
 263     {
 264         fprintf(stderr, "Failed to open %s, %s %d-bit, %s, %dhz (%d samples)\n",
 265             devname ? devname : "default device",
 266             (recorder.mBits == 32) ? "Float" :
 267             (recorder.mBits !=  8) ? "Signed" : "Unsigned", recorder.mBits,
 268             (recorder.mChannels == 1) ? "Mono" : "Stereo", recorder.mSampleRate,
 269             32768
 270         );
 271         return 1;
 272     }
 273     fprintf(stderr, "Opened \"%s\"\n", alcGetString(
 274         recorder.mDevice, ALC_CAPTURE_DEVICE_SPECIFIER
 275     ));
 276
 277     recorder.mFile = fopen(fname, "wb");
 278     if(!recorder.mFile)
 279     {
 280         fprintf(stderr, "Failed to open '%s' for writing\n", fname);
 281         alcCaptureCloseDevice(recorder.mDevice);
 282         return 1;
 283     }
 284
 285     fputs("RIFF", recorder.mFile);
 286     fwrite32le(0xFFFFFFFF, recorder.mFile); // 'RIFF' header len; filled in at close
 287
 288     fputs("WAVE", recorder.mFile);
 289
 290     fputs("fmt ", recorder.mFile);
 291     fwrite32le(18, recorder.mFile); // 'fmt ' header len
 292
 293     // 16-bit val, format type id (1 = integer PCM, 3 = float PCM)
 294     fwrite16le((recorder.mBits == 32) ? 0x0003 : 0x0001, recorder.mFile);
 295     // 16-bit val, channel count
 296     fwrite16le((ALushort)recorder.mChannels, recorder.mFile);
 297     // 32-bit val, frequency
 298     fwrite32le(recorder.mSampleRate, recorder.mFile);
 299     // 32-bit val, bytes per second
 300     fwrite32le(recorder.mSampleRate * recorder.mFrameSize, recorder.mFile);
 301     // 16-bit val, frame size
 302     fwrite16le((ALushort)recorder.mFrameSize, recorder.mFile);
 303     // 16-bit val, bits per sample
 304     fwrite16le((ALushort)recorder.mBits, recorder.mFile);
 305     // 16-bit val, extra byte count
 306     fwrite16le(0, recorder.mFile);
 307
 308     fputs("data", recorder.mFile);
 309     fwrite32le(0xFFFFFFFF, recorder.mFile); // 'data' header len; filled in at close
 310
 311     recorder.mDataSizeOffset = ftell(recorder.mFile) - 4;
 312     if(ferror(recorder.mFile) || recorder.mDataSizeOffset < 0)
 313     {
 314         fprintf(stderr, "Error writing header: %s\n", strerror(errno));
 315         fclose(recorder.mFile);
 316         alcCaptureCloseDevice(recorder.mDevice);
 317         return 1;
 318     }
 319
 320     fprintf(stderr, "Recording '%s', %s %d-bit, %s, %dhz (%g second%s)\n", fname,
 321         (recorder.mBits == 32) ? "Float" :
 322         (recorder.mBits !=  8) ? "Signed" : "Unsigned", recorder.mBits,
 323         (recorder.mChannels == 1) ? "Mono" : "Stereo", recorder.mSampleRate,
 324         recorder.mRecTime, (recorder.mRecTime != 1.0f) ? "s" : ""
 325     );
 326
 327     err = ALC_NO_ERROR;
 328     alcCaptureStart(recorder.mDevice);
 329     while((double)recorder.mDataSize/(double)recorder.mSampleRate < recorder.mRecTime &&
 330           (err=alcGetError(recorder.mDevice)) == ALC_NO_ERROR && !ferror(recorder.mFile))
 331     {
 332         ALCint count = 0;
 333         fprintf(stderr, "\rCaptured %u samples", recorder.mDataSize);
 334         alcGetIntegerv(recorder.mDevice, ALC_CAPTURE_SAMPLES, 1, &count);
 335         if(count < 1)
 336         {
 337             al_nssleep(10000000);
 338             continue;
 339         }
 340         if(count > recorder.mBufferSize)
 341         {
 342             ALbyte *data = calloc(recorder.mFrameSize, (ALuint)count);
 343             free(recorder.mBuffer);
 344             recorder.mBuffer = data;
 345             recorder.mBufferSize = count;
 346         }
 347         alcCaptureSamples(recorder.mDevice, recorder.mBuffer, count);
 348 #if defined(__BYTE_ORDER) && __BYTE_ORDER == __BIG_ENDIAN
 349         /* Byteswap multibyte samples on big-endian systems (wav needs little-
 350          * endian, and OpenAL gives the system's native-endian).
 351          */
 352         if(recorder.mBits == 16)
 353         {
 354             ALCint i;
 355             for(i = 0;i < count*recorder.mChannels;i++)
 356             {
 357                 ALbyte b = recorder.mBuffer[i*2 + 0];
 358                 recorder.mBuffer[i*2 + 0] = recorder.mBuffer[i*2 + 1];
 359                 recorder.mBuffer[i*2 + 1] = b;
 360             }
 361         }
 362         else if(recorder.mBits == 32)
 363         {
 364             ALCint i;
 365             for(i = 0;i < count*recorder.mChannels;i++)
 366             {
 367                 ALbyte b0 = recorder.mBuffer[i*4 + 0];
 368                 ALbyte b1 = recorder.mBuffer[i*4 + 1];
 369                 recorder.mBuffer[i*4 + 0] = recorder.mBuffer[i*4 + 3];
 370                 recorder.mBuffer[i*4 + 1] = recorder.mBuffer[i*4 + 2];
 371                 recorder.mBuffer[i*4 + 2] = b1;
 372                 recorder.mBuffer[i*4 + 3] = b0;
 373             }
 374         }
 375 #endif
 376         recorder.mDataSize += (ALuint)fwrite(recorder.mBuffer, recorder.mFrameSize, (ALuint)count,
 377                                              recorder.mFile);
 378     }
 379     alcCaptureStop(recorder.mDevice);
 380     fprintf(stderr, "\rCaptured %u samples\n", recorder.mDataSize);
 381     if(err != ALC_NO_ERROR)
 382         fprintf(stderr, "Got device error 0x%04x: %s\n", err, alcGetString(recorder.mDevice, err));
 383
 384     alcCaptureCloseDevice(recorder.mDevice);
 385     recorder.mDevice = NULL;
 386
 387     free(recorder.mBuffer);
 388     recorder.mBuffer = NULL;
 389     recorder.mBufferSize = 0;
 390
 391     total_size = ftell(recorder.mFile);
 392     if(fseek(recorder.mFile, recorder.mDataSizeOffset, SEEK_SET) == 0)
 393     {
 394         fwrite32le(recorder.mDataSize*recorder.mFrameSize, recorder.mFile);
 395         if(fseek(recorder.mFile, 4, SEEK_SET) == 0)
 396             fwrite32le((ALuint)total_size - 8, recorder.mFile);
 397     }
 398
 399     fclose(recorder.mFile);
 400     recorder.mFile = NULL;
 401
 402     return 0;
 403 }