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