apps/codecs/wav.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Dave Chapman
  11  * Copyright (C) 2009 Yoshihisa Uchida
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22
  23 #include "codeclib.h"
  24 #include "inttypes.h"
  25 #include "codecs/libpcm/support_formats.h"
  26
  27 CODEC_HEADER
  28
  29 /* WAVE (RIFF) codec:
  30  *
  31  *  For a good documentation on WAVE files, see:
  32  *  http://www.tsp.ece.mcgill.ca/MMSP/Documents/AudioFormats/WAVE/WAVE.html
  33  *  and
  34  *  http://www.sonicspot.com/guide/wavefiles.html
  35  *
  36  *  For sample WAV files, see:
  37  *  http://www.tsp.ece.mcgill.ca/MMSP/Documents/AudioFormats/WAVE/Samples.html
  38  *
  39  */
  40
  41 static int32_t samples[PCM_CHUNK_SIZE] IBSS_ATTR;
  42
  43 /* This codec support WAVE files with the following formats: */
  44 enum
  45 {
  46     WAVE_FORMAT_UNKNOWN = 0x0000, /* Microsoft Unknown Wave Format */
  47     WAVE_FORMAT_PCM = 0x0001,   /* Microsoft PCM Format */
  48     WAVE_FORMAT_IEEE_FLOAT = 0x0003, /* IEEE Float */
  49     WAVE_FORMAT_ALAW = 0x0006,  /* Microsoft ALAW */
  50     WAVE_FORMAT_MULAW = 0x0007, /* Microsoft MULAW */
  51     WAVE_FORMAT_DVI_ADPCM = 0x0011, /* Intel's DVI ADPCM */
  52     IBM_FORMAT_MULAW = 0x0101,  /* same as WAVE_FORMAT_MULAW */
  53     IBM_FORMAT_ALAW = 0x0102,   /* same as WAVE_FORMAT_ALAW */
  54     WAVE_FORMAT_EXTENSIBLE = 0xFFFE
  55 };
  56
  57 const struct pcm_entry wave_codecs[] = {
  58     { WAVE_FORMAT_UNKNOWN,            0                            },
  59     { WAVE_FORMAT_PCM,                get_linear_pcm_codec         },
  60     { WAVE_FORMAT_IEEE_FLOAT,         get_ieee_float_codec         },
  61     { WAVE_FORMAT_ALAW,               get_itut_g711_alaw_codec     },
  62     { WAVE_FORMAT_MULAW,              get_itut_g711_mulaw_codec    },
  63     { WAVE_FORMAT_DVI_ADPCM,          get_dvi_adpcm_codec          },
  64     { IBM_FORMAT_MULAW,               get_itut_g711_mulaw_codec    },
  65     { IBM_FORMAT_ALAW,                get_itut_g711_alaw_codec     },
  66 };
  67
  68 #define NUM_FORMATS 8
  69
  70 static const struct pcm_codec *get_wave_codec(uint32_t formattag)
  71 {
  72     int i;
  73
  74     for (i = 0; i < NUM_FORMATS; i++)
  75     {
  76         if (wave_codecs[i].format_tag == formattag)
  77         {
  78             if (wave_codecs[i].get_codec)
  79                 return wave_codecs[i].get_codec();
  80             return 0;
  81         }
  82     }
  83     return 0;
  84 }
  85
  86
  87 /* this is the codec entry point */
  88 enum codec_status codec_main(void)
  89 {
  90     int status = CODEC_OK;
  91     struct pcm_format format;
  92     uint32_t bytesdone, decodedbytes;
  93     uint32_t i;
  94     size_t n;
  95     int bufcount;
  96     int endofstream;
  97     unsigned char *buf;
  98     uint8_t *wavbuf;
  99     off_t firstblockposn;     /* position of the first block in file */
 100     const struct pcm_codec *codec;
 101
 102     /* Generic codec initialisation */
 103     ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
 104
 105 next_track:
 106     if (codec_init()) {
 107         DEBUGF("codec_init() error\n");
 108         status = CODEC_ERROR;
 109         goto exit;
 110     }
 111
 112     while (!*ci->taginfo_ready && !ci->stop_codec)
 113         ci->sleep(1);
 114
 115     codec_set_replaygain(ci->id3);
 116
 117     /* Need to save offset for later use (cleared indirectly by advance_buffer) */
 118     bytesdone = ci->id3->offset;
 119
 120     /* get RIFF chunk header */
 121     buf = ci->request_buffer(&n, 12);
 122     if (n < 12) {
 123         DEBUGF("request_buffer error\n");
 124         status = CODEC_ERROR;
 125         goto done;
 126     }
 127     if ((memcmp(buf, "RIFF", 4) != 0) || (memcmp(&buf[8], "WAVE", 4) != 0)) {
 128         status = CODEC_ERROR;
 129         goto done;
 130     }
 131
 132     /* advance to first WAVE chunk */
 133     ci->advance_buffer(12);
 134
 135     firstblockposn = 12;
 136     ci->memset(&format, 0, sizeof(struct pcm_format));
 137     format.is_signed = true;
 138     format.is_little_endian = true;
 139
 140     decodedbytes = 0;
 141     codec = 0;
 142
 143     /* iterate over WAVE chunks until the 'data' chunk, which should be after the 'fmt ' chunk */
 144     while (true) {
 145         /* get WAVE chunk header */
 146         buf = ci->request_buffer(&n, 1024);
 147         if (n < 8) {
 148             DEBUGF("data chunk request_buffer error\n");
 149             /* no more chunks, 'data' chunk must not have been found */
 150             status = CODEC_ERROR;
 151             goto done;
 152         }
 153
 154         /* chunkSize */
 155         i = (buf[4]|(buf[5]<<8)|(buf[6]<<16)|(buf[7]<<24));
 156         if (memcmp(buf, "fmt ", 4) == 0) {
 157             if (i < 16) {
 158                 DEBUGF("CODEC_ERROR: 'fmt ' chunk size=%lu < 16\n",
 159                        (unsigned long)i);
 160                 status = CODEC_ERROR;
 161                 goto done;
 162             }
 163             /* wFormatTag */
 164             format.formattag=buf[8]|(buf[9]<<8);
 165             /* wChannels */
 166             format.channels=buf[10]|(buf[11]<<8);
 167             /* skipping dwSamplesPerSec */
 168             /* dwAvgBytesPerSec */
 169             format.avgbytespersec = buf[16]|(buf[17]<<8)|(buf[18]<<16)|(buf[19]<<24);
 170             /* wBlockAlign */
 171             format.blockalign=buf[20]|(buf[21]<<8);
 172             /* wBitsPerSample */
 173             format.bitspersample=buf[22]|(buf[23]<<8);
 174             if (format.formattag != WAVE_FORMAT_PCM) {
 175                 if (i < 18) {
 176                     /* this is not a fatal error with some formats,
 177                      * we'll see later if we can't decode it */
 178                     DEBUGF("CODEC_WARNING: non-PCM WAVE (formattag=0x%x) "
 179                            "doesn't have ext. fmt descr (chunksize=%d<18).\n",
 180                            (unsigned int)format.formattag, i);
 181                 }
 182                 else
 183                 {
 184                     format.size = buf[24]|(buf[25]<<8);
 185                     if (format.formattag != WAVE_FORMAT_EXTENSIBLE)
 186                         format.samplesperblock = buf[26]|(buf[27]<<8);
 187                     else {
 188                         if (format.size < 22) {
 189                             DEBUGF("CODEC_ERROR: WAVE_FORMAT_EXTENSIBLE is "
 190                                    "missing extension\n");
 191                             status = CODEC_ERROR;
 192                             goto done;
 193                         }
 194                         /* wValidBitsPerSample */
 195                         format.bitspersample = buf[26]|(buf[27]<<8);
 196                         /* skipping dwChannelMask (4bytes) */
 197                         /* SubFormat (only get the first two bytes) */
 198                         format.formattag = buf[32]|(buf[33]<<8);
 199                     }
 200                 }
 201             }
 202
 203             /* get codec */
 204             codec = get_wave_codec(format.formattag);
 205             if (!codec)
 206             {
 207                 DEBUGF("CODEC_ERROR: unsupported wave format %x\n",
 208                     (unsigned int) format.formattag);
 209                 status = CODEC_ERROR;
 210                 goto done;
 211             }
 212
 213             /* riff 8bit linear pcm is unsigned */
 214             if (format.formattag == WAVE_FORMAT_PCM && format.bitspersample == 8)
 215                 format.is_signed = false;
 216
 217             /* set format, parse codec specific tag, check format, and calculate chunk size */
 218             if (!codec->set_format(&format, buf))
 219             {
 220                 status = CODEC_ERROR;
 221                 goto done;
 222             }
 223         } else if (memcmp(buf, "data", 4) == 0) {
 224             format.numbytes = i;
 225             /* advance to start of data */
 226             ci->advance_buffer(8);
 227             firstblockposn += 8;
 228             break;
 229         } else if (memcmp(buf, "fact", 4) == 0) {
 230             /* dwSampleLength */
 231             if (i >= 4)
 232                 format.totalsamples =
 233                              (buf[8]|(buf[9]<<8)|(buf[10]<<16)|(buf[11]<<24));
 234         } else {
 235             DEBUGF("unknown WAVE chunk: '%c%c%c%c', size=%lu\n",
 236                    buf[0], buf[1], buf[2], buf[3], (unsigned long)i);
 237         }
 238
 239         /* go to next chunk (even chunk sizes must be padded) */
 240         if (i & 0x01)
 241             i++;
 242         ci->advance_buffer(i+8);
 243         firstblockposn += i + 8;
 244     }
 245
 246     if (!codec)
 247     {
 248         DEBUGF("CODEC_ERROR: 'fmt ' chunk not found\n");
 249         status = CODEC_ERROR;
 250         goto done;
 251     }
 252
 253     /* common format check */
 254     if (format.channels == 0) {
 255         DEBUGF("CODEC_ERROR: 'fmt ' chunk not found or 0-channels file\n");
 256         status = CODEC_ERROR;
 257         goto done;
 258     }
 259     if (format.numbytes == 0) {
 260         DEBUGF("CODEC_ERROR: 'data' chunk not found or has zero-length\n");
 261         status = CODEC_ERROR;
 262         goto done;
 263     }
 264
 265     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
 266     if (format.channels == 2) {
 267         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
 268     } else if (format.channels == 1) {
 269         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
 270     } else {
 271         DEBUGF("CODEC_ERROR: more than 2 channels\n");
 272         status = CODEC_ERROR;
 273         goto done;
 274     }
 275
 276     /* make sure we're at the correct offset */
 277     if (bytesdone > (uint32_t) firstblockposn) {
 278         /* Round down to previous block */
 279         uint32_t offset = bytesdone - bytesdone % format.blockalign;
 280
 281         ci->advance_buffer(offset-firstblockposn);
 282         bytesdone = offset - firstblockposn;
 283     } else {
 284         /* already where we need to be */
 285         bytesdone = 0;
 286     }
 287
 288     /* The main decoder loop */
 289     endofstream = 0;
 290
 291     while (!endofstream) {
 292         ci->yield();
 293         if (ci->stop_codec || ci->new_track) {
 294             break;
 295         }
 296
 297         if (ci->seek_time) {
 298             uint32_t newpos = codec->get_seek_pos(ci->seek_time);
 299
 300             if (newpos > format.numbytes)
 301                 break;
 302             if (ci->seek_buffer(firstblockposn + newpos))
 303             {
 304                 bytesdone = newpos;
 305             }
 306             ci->seek_complete();
 307         }
 308
 309         wavbuf = (uint8_t *)ci->request_buffer(&n, format.chunksize);
 310         if (n == 0)
 311             break; /* End of stream */
 312         if (bytesdone + n > format.numbytes) {
 313             n = format.numbytes - bytesdone;
 314             endofstream = 1;
 315         }
 316
 317         status = codec->decode(wavbuf, n, samples, &bufcount);
 318         if (status == CODEC_ERROR)
 319         {
 320             DEBUGF("codec error\n");
 321             goto done;
 322         }
 323
 324         ci->pcmbuf_insert(samples, NULL, bufcount);
 325         ci->advance_buffer(n);
 326         bytesdone += n;
 327         decodedbytes += bufcount;
 328
 329         if (bytesdone >= format.numbytes)
 330             endofstream = 1;
 331         ci->set_elapsed(decodedbytes*1000LL/ci->id3->frequency);
 332     }
 333     status = CODEC_OK;
 334
 335 done:
 336     if (ci->request_next_track())
 337         goto next_track;
 338
 339 exit:
 340     return status;
 341 }