apps/codecs/au.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 Yoshihisa Uchida
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #include "codeclib.h"
  23 #include "codecs/libpcm/support_formats.h"
  24
  25 CODEC_HEADER
  26
  27 /* Sun Audio file (Au file format) codec
  28  *
  29  * References
  30  * [1] Sun Microsystems, Inc., Header file for Audio, .au, 1992
  31  *     URL http://www.opengroup.org/public/pubs/external/auformat.html
  32  * [2] Wikipedia, Au file format, URL: http://en.wikipedia.org/wiki/Sun_Audio
  33  */
  34
  35 #define PCM_SAMPLE_SIZE (1024*2)
  36
  37 static int32_t samples[PCM_SAMPLE_SIZE] IBSS_ATTR;
  38
  39 enum
  40 {
  41     AU_FORMAT_UNSUPPORT = 0, /* unsupported format */
  42     AU_FORMAT_MULAW,         /* G.711 MULAW */
  43     AU_FORMAT_PCM,           /* Linear PCM */
  44     AU_FORMAT_IEEE_FLOAT,    /* IEEE float */
  45     AU_FORMAT_ALAW,          /* G.711 ALAW */
  46 };
  47
  48 static const char support_formats[9][2] = {
  49   { AU_FORMAT_UNSUPPORT,  0  }, /* encoding */
  50   { AU_FORMAT_MULAW,      8  }, /* 1:  G.711 MULAW */
  51   { AU_FORMAT_PCM,        8  }, /* 2:  Linear PCM 8bit (signed) */
  52   { AU_FORMAT_PCM,        16 }, /* 3:  Linear PCM 16bit (signed, big endian) */
  53   { AU_FORMAT_PCM,        24 }, /* 4:  Linear PCM 24bit (signed, big endian) */
  54   { AU_FORMAT_PCM,        32 }, /* 5:  Linear PCM 32bit (signed, big endian) */
  55   { AU_FORMAT_IEEE_FLOAT, 32 }, /* 6:  Linear PCM float 32bit (signed, big endian) */
  56   { AU_FORMAT_IEEE_FLOAT, 64 }, /* 7:  Linear PCM float 64bit (signed, big endian) */
  57                                 /* encoding 8 - 26 unsupported. */
  58   { AU_FORMAT_ALAW,       8  }, /* 27: G.711 ALAW */
  59 };
  60
  61 const struct pcm_entry au_codecs[] = {
  62     { AU_FORMAT_MULAW,      get_itut_g711_mulaw_codec },
  63     { AU_FORMAT_PCM,        get_linear_pcm_codec      },
  64     { AU_FORMAT_IEEE_FLOAT, get_ieee_float_codec      },
  65     { AU_FORMAT_ALAW,       get_itut_g711_alaw_codec  },
  66 };
  67
  68 #define NUM_FORMATS 4
  69
  70 static const struct pcm_codec *get_au_codec(uint32_t formattag)
  71 {
  72     int i;
  73
  74     for (i = 0; i < NUM_FORMATS; i++)
  75     {
  76         if (au_codecs[i].format_tag == formattag)
  77         {
  78             if (au_codecs[i].get_codec)
  79                 return au_codecs[i].get_codec();
  80             return 0;
  81         }
  82     }
  83     return 0;
  84 }
  85
  86 static unsigned int get_be32(uint8_t *buf)
  87 {
  88     return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
  89 }
  90
  91 static int convert_au_format(unsigned int encoding, struct pcm_format *fmt)
  92 {
  93     fmt->formattag = AU_FORMAT_UNSUPPORT;
  94     if (encoding < 8)
  95     {
  96         fmt->formattag = support_formats[encoding][0];
  97         fmt->bitspersample = support_formats[encoding][1];
  98     }
  99     else if (encoding == 27)
 100     {
 101         fmt->formattag = support_formats[8][0];
 102         fmt->bitspersample = support_formats[8][1];
 103     }
 104
 105     return fmt->formattag;
 106 }
 107
 108 /* this is the codec entry point */
 109 enum codec_status codec_main(void)
 110 {
 111     int status = CODEC_OK;
 112     struct pcm_format format;
 113     uint32_t bytesdone, decodedsamples;
 114     size_t n;
 115     int bufcount;
 116     int endofstream;
 117     unsigned char *buf;
 118     uint8_t *aubuf;
 119     off_t firstblockposn;     /* position of the first block in file */
 120     const struct pcm_codec *codec;
 121     int offset = 0;
 122
 123     /* Generic codec initialisation */
 124     ci->configure(DSP_SET_SAMPLE_DEPTH, PCM_OUTPUT_DEPTH-1);
 125
 126 next_track:
 127     if (codec_init()) {
 128         DEBUGF("codec_init() error\n");
 129         status = CODEC_ERROR;
 130         goto exit;
 131     }
 132
 133     while (!*ci->taginfo_ready && !ci->stop_codec)
 134         ci->sleep(1);
 135
 136     codec_set_replaygain(ci->id3);
 137
 138     /* Need to save offset for later use (cleared indirectly by advance_buffer) */
 139     bytesdone = ci->id3->offset;
 140
 141     ci->memset(&format, 0, sizeof(struct pcm_format));
 142     format.is_signed = true;
 143     format.is_little_endian = false;
 144
 145     /* set format */
 146     buf = ci->request_buffer(&n, 24);
 147     if (n < 24 || (memcmp(buf, ".snd", 4) != 0))
 148     {
 149         /*
 150          * headerless sun audio file
 151          * It is decoded under conditions.
 152          *     format:    G.711 mu-law
 153          *     channel:   mono
 154          *     frequency: 8000 kHz
 155          */
 156         offset = 0;
 157         format.formattag     = AU_FORMAT_MULAW;
 158         format.channels      = 1;
 159         format.bitspersample = 8;
 160         format.numbytes      = ci->id3->filesize;
 161     }
 162     else
 163     {
 164         /* parse header */
 165
 166         /* data offset */
 167         offset = get_be32(buf + 4);
 168         if (offset < 24)
 169         {
 170             DEBUGF("CODEC_ERROR: sun audio offset size is small: %d\n", offset);
 171             status = CODEC_ERROR;
 172             goto done;
 173         }
 174         /* data size */
 175         format.numbytes = get_be32(buf + 8);
 176         if (format.numbytes == (uint32_t)0xffffffff)
 177             format.numbytes = ci->id3->filesize - offset;
 178         /* encoding */
 179         format.formattag = convert_au_format(get_be32(buf + 12), &format);
 180         if (format.formattag == AU_FORMAT_UNSUPPORT)
 181         {
 182             DEBUGF("CODEC_ERROR: sun audio unsupport format: %d\n", get_be32(buf + 12));
 183             status = CODEC_ERROR;
 184             goto done;
 185         }
 186         /* skip sample rate */
 187         format.channels = get_be32(buf + 20);
 188     }
 189
 190     /* advance to first WAVE chunk */
 191     ci->advance_buffer(offset);
 192
 193     firstblockposn = offset;
 194
 195     decodedsamples = 0;
 196     codec = 0;
 197
 198     /* get codec */
 199     codec = get_au_codec(format.formattag);
 200     if (!codec)
 201     {
 202         DEBUGF("CODEC_ERROR: unsupport sun audio format: %x\n", (int)format.formattag);
 203         status = CODEC_ERROR;
 204         goto done;
 205     }
 206
 207     if (!codec->set_format(&format))
 208     {
 209         status = CODEC_ERROR;
 210         goto done;
 211     }
 212
 213     if (format.numbytes == 0) {
 214         DEBUGF("CODEC_ERROR: data size is 0\n");
 215         status = CODEC_ERROR;
 216         goto done;
 217     }
 218
 219     /* check chunksize */
 220     if ((format.chunksize / format.blockalign) * format.samplesperblock * format.channels
 221            > PCM_SAMPLE_SIZE)
 222         format.chunksize = (PCM_SAMPLE_SIZE / format.blockalign) * format.blockalign;
 223     if (format.chunksize == 0)
 224     {
 225         DEBUGF("CODEC_ERROR: chunksize is 0\n");
 226         status = CODEC_ERROR;
 227         goto done;
 228     }
 229
 230     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
 231     if (format.channels == 2) {
 232         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
 233     } else if (format.channels == 1) {
 234         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
 235     } else {
 236         DEBUGF("CODEC_ERROR: more than 2 channels\n");
 237         status = CODEC_ERROR;
 238         goto done;
 239     }
 240
 241     /* make sure we're at the correct offset */
 242     if (bytesdone > (uint32_t) firstblockposn) {
 243         /* Round down to previous block */
 244         struct pcm_pos *newpos = codec->get_seek_pos(bytesdone - firstblockposn,
 245                                                      PCM_SEEK_POS, NULL);
 246
 247         if (newpos->pos > format.numbytes)
 248             goto done;
 249         if (ci->seek_buffer(firstblockposn + newpos->pos))
 250         {
 251             bytesdone      = newpos->pos;
 252             decodedsamples = newpos->samples;
 253         }
 254         ci->seek_complete();
 255     } else {
 256         /* already where we need to be */
 257         bytesdone = 0;
 258     }
 259
 260     /* The main decoder loop */
 261     endofstream = 0;
 262
 263     while (!endofstream) {
 264         ci->yield();
 265         if (ci->stop_codec || ci->new_track) {
 266             break;
 267         }
 268
 269         if (ci->seek_time) {
 270             /* 3rd args(read_buffer) is unnecessary in the format which Sun Audio supports.  */
 271             struct pcm_pos *newpos = codec->get_seek_pos(ci->seek_time, PCM_SEEK_TIME, NULL);
 272
 273             if (newpos->pos > format.numbytes)
 274                 break;
 275             if (ci->seek_buffer(firstblockposn + newpos->pos))
 276             {
 277                 bytesdone      = newpos->pos;
 278                 decodedsamples = newpos->samples;
 279             }
 280             ci->seek_complete();
 281         }
 282
 283         aubuf = (uint8_t *)ci->request_buffer(&n, format.chunksize);
 284         if (n == 0)
 285             break; /* End of stream */
 286         if (bytesdone + n > format.numbytes) {
 287             n = format.numbytes - bytesdone;
 288             endofstream = 1;
 289         }
 290
 291         status = codec->decode(aubuf, n, samples, &bufcount);
 292         if (status == CODEC_ERROR)
 293         {
 294             DEBUGF("codec error\n");
 295             goto done;
 296         }
 297
 298         ci->pcmbuf_insert(samples, NULL, bufcount);
 299         ci->advance_buffer(n);
 300         bytesdone += n;
 301         decodedsamples += bufcount;
 302
 303         if (bytesdone >= format.numbytes)
 304             endofstream = 1;
 305         ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
 306     }
 307     status = CODEC_OK;
 308
 309 done:
 310     if (ci->request_next_track())
 311         goto next_track;
 312
 313 exit:
 314     return status;
 315 }