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;
 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     status = CODEC_OK;
 128
 129     if (codec_init()) {
 130         DEBUGF("codec_init() error\n");
 131         status = CODEC_ERROR;
 132         goto exit;
 133     }
 134
 135     if (codec_wait_taginfo() != 0)
 136         goto done;
 137
 138     codec_set_replaygain(ci->id3);
 139
 140     /* Need to save offset for later use (cleared indirectly by advance_buffer) */
 141     bytesdone = ci->id3->offset;
 142
 143     ci->memset(&format, 0, sizeof(struct pcm_format));
 144     format.is_signed = true;
 145     format.is_little_endian = false;
 146
 147     /* set format */
 148     buf = ci->request_buffer(&n, 24);
 149     if (n < 24 || (memcmp(buf, ".snd", 4) != 0))
 150     {
 151         /*
 152          * headerless sun audio file
 153          * It is decoded under conditions.
 154          *     format:    G.711 mu-law
 155          *     channel:   mono
 156          *     frequency: 8000 kHz
 157          */
 158         offset = 0;
 159         format.formattag     = AU_FORMAT_MULAW;
 160         format.channels      = 1;
 161         format.bitspersample = 8;
 162         format.numbytes      = ci->id3->filesize;
 163     }
 164     else
 165     {
 166         /* parse header */
 167
 168         /* data offset */
 169         offset = get_be32(buf + 4);
 170         if (offset < 24)
 171         {
 172             DEBUGF("CODEC_ERROR: sun audio offset size is small: %d\n", offset);
 173             status = CODEC_ERROR;
 174             goto done;
 175         }
 176         /* data size */
 177         format.numbytes = get_be32(buf + 8);
 178         if (format.numbytes == (uint32_t)0xffffffff)
 179             format.numbytes = ci->id3->filesize - offset;
 180         /* encoding */
 181         format.formattag = convert_au_format(get_be32(buf + 12), &format);
 182         if (format.formattag == AU_FORMAT_UNSUPPORT)
 183         {
 184             DEBUGF("CODEC_ERROR: sun audio unsupport format: %d\n", get_be32(buf + 12));
 185             status = CODEC_ERROR;
 186             goto done;
 187         }
 188         /* skip sample rate */
 189         format.channels = get_be32(buf + 20);
 190     }
 191
 192     /* advance to first WAVE chunk */
 193     ci->advance_buffer(offset);
 194
 195     firstblockposn = offset;
 196
 197     decodedsamples = 0;
 198     codec = 0;
 199
 200     /* get codec */
 201     codec = get_au_codec(format.formattag);
 202     if (!codec)
 203     {
 204         DEBUGF("CODEC_ERROR: unsupport sun audio format: %x\n", (int)format.formattag);
 205         status = CODEC_ERROR;
 206         goto done;
 207     }
 208
 209     if (!codec->set_format(&format))
 210     {
 211         status = CODEC_ERROR;
 212         goto done;
 213     }
 214
 215     if (format.numbytes == 0) {
 216         DEBUGF("CODEC_ERROR: data size is 0\n");
 217         status = CODEC_ERROR;
 218         goto done;
 219     }
 220
 221     /* check chunksize */
 222     if ((format.chunksize / format.blockalign) * format.samplesperblock * format.channels
 223            > PCM_SAMPLE_SIZE)
 224         format.chunksize = (PCM_SAMPLE_SIZE / format.blockalign) * format.blockalign;
 225     if (format.chunksize == 0)
 226     {
 227         DEBUGF("CODEC_ERROR: chunksize is 0\n");
 228         status = CODEC_ERROR;
 229         goto done;
 230     }
 231
 232     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
 233     if (format.channels == 2) {
 234         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
 235     } else if (format.channels == 1) {
 236         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
 237     } else {
 238         DEBUGF("CODEC_ERROR: more than 2 channels\n");
 239         status = CODEC_ERROR;
 240         goto done;
 241     }
 242
 243     /* make sure we're at the correct offset */
 244     if (bytesdone > (uint32_t) firstblockposn) {
 245         /* Round down to previous block */
 246         struct pcm_pos *newpos = codec->get_seek_pos(bytesdone - firstblockposn,
 247                                                      PCM_SEEK_POS, NULL);
 248
 249         if (newpos->pos > format.numbytes)
 250             goto done;
 251         if (ci->seek_buffer(firstblockposn + newpos->pos))
 252         {
 253             bytesdone      = newpos->pos;
 254             decodedsamples = newpos->samples;
 255         }
 256         ci->seek_complete();
 257     } else {
 258         /* already where we need to be */
 259         bytesdone = 0;
 260     }
 261
 262     /* The main decoder loop */
 263     endofstream = 0;
 264
 265     while (!endofstream) {
 266         ci->yield();
 267         if (ci->stop_codec || ci->new_track) {
 268             break;
 269         }
 270
 271         if (ci->seek_time) {
 272             /* 3rd args(read_buffer) is unnecessary in the format which Sun Audio supports.  */
 273             struct pcm_pos *newpos = codec->get_seek_pos(ci->seek_time, PCM_SEEK_TIME, NULL);
 274
 275             if (newpos->pos > format.numbytes)
 276                 break;
 277             if (ci->seek_buffer(firstblockposn + newpos->pos))
 278             {
 279                 bytesdone      = newpos->pos;
 280                 decodedsamples = newpos->samples;
 281             }
 282             ci->seek_complete();
 283         }
 284
 285         aubuf = (uint8_t *)ci->request_buffer(&n, format.chunksize);
 286         if (n == 0)
 287             break; /* End of stream */
 288         if (bytesdone + n > format.numbytes) {
 289             n = format.numbytes - bytesdone;
 290             endofstream = 1;
 291         }
 292
 293         status = codec->decode(aubuf, n, samples, &bufcount);
 294         if (status == CODEC_ERROR)
 295         {
 296             DEBUGF("codec error\n");
 297             goto done;
 298         }
 299
 300         ci->pcmbuf_insert(samples, NULL, bufcount);
 301         ci->advance_buffer(n);
 302         bytesdone += n;
 303         decodedsamples += bufcount;
 304
 305         if (bytesdone >= format.numbytes)
 306             endofstream = 1;
 307         ci->set_elapsed(decodedsamples*1000LL/ci->id3->frequency);
 308     }
 309
 310 done:
 311     if (ci->request_next_track())
 312         goto next_track;
 313
 314 exit:
 315     return status;
 316 }