apps/codecs/aiff.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (c) 2005 Jvo Studer
  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 <inttypes.h>
  24
  25 CODEC_HEADER
  26
  27 /* Macro that sign extends an unsigned byte */
  28 #define SE(x) ((int32_t)((int8_t)(x)))
  29
  30 /* This codec supports AIFF files with the following formats:
  31  * - PCM, 8, 16 and 24 bits, mono or stereo
  32  */
  33
  34 enum
  35 {
  36     AIFF_FORMAT_PCM = 0x0001,   /* AIFF PCM Format (big endian) */
  37     IEEE_FORMAT_FLOAT = 0x0003, /* IEEE Float */
  38     AIFF_FORMAT_ALAW = 0x0004,  /* AIFC ALaw compressed */
  39     AIFF_FORMAT_ULAW = 0x0005   /* AIFC uLaw compressed */
  40 };
  41
  42 /* Maximum number of bytes to process in one iteration */
  43 /* for 44.1kHz stereo 16bits, this represents 0.023s ~= 1/50s */
  44 #define AIF_CHUNK_SIZE (1024*2)
  45
  46 static int32_t samples[AIF_CHUNK_SIZE] IBSS_ATTR;
  47
  48 enum codec_status codec_main(void)
  49 {
  50     uint32_t numbytes, bytesdone;
  51     uint16_t num_channels = 0;
  52     uint32_t num_sample_frames = 0;
  53     uint16_t sample_size = 0;
  54     uint32_t sample_rate = 0;
  55     uint32_t i;
  56     size_t n;
  57     int bufcount;
  58     int endofstream;
  59     unsigned char *buf;
  60     uint8_t *aifbuf;
  61     long chunksize;
  62     uint32_t offset2snd = 0;
  63     uint16_t block_size = 0;
  64     uint32_t avgbytespersec = 0;
  65     off_t firstblockposn;     /* position of the first block in file */
  66
  67     /* Generic codec initialisation */
  68     ci->configure(DSP_SET_SAMPLE_DEPTH, 28);
  69     ci->configure(CODEC_SET_FILEBUF_WATERMARK, 1024*512);
  70
  71 next_track:
  72     if (codec_init()) {
  73         i = CODEC_ERROR;
  74         goto exit;
  75     }
  76
  77     while (!*ci->taginfo_ready && !ci->stop_codec)
  78         ci->sleep(1);
  79
  80     codec_set_replaygain(ci->id3);
  81
  82     /* assume the AIFF header is less than 1024 bytes */
  83     buf = ci->request_buffer(&n, 1024);
  84     if (n < 54) {
  85         i = CODEC_ERROR;
  86         goto done;
  87     }
  88     if ((memcmp(buf, "FORM", 4) != 0) || (memcmp(&buf[8], "AIFF", 4) != 0)) {
  89         i = CODEC_ERROR;
  90         goto done;
  91     }
  92
  93     buf += 12;
  94     n -= 12;
  95     numbytes = 0;
  96
  97     /* read until 'SSND' chunk, which typically is last */
  98     while (numbytes == 0 && n >= 8) {
  99         /* chunkSize */
 100         i = ((buf[4]<<24)|(buf[5]<<16)|(buf[6]<<8)|buf[7]);
 101         if (memcmp(buf, "COMM", 4) == 0) {
 102             if (i < 18) {
 103                 DEBUGF("CODEC_ERROR: 'COMM' chunk size=%lu < 18\n",
 104                        (unsigned long)i);
 105                 i = CODEC_ERROR;
 106                 goto done;
 107             }
 108             /* num_channels */
 109             num_channels = ((buf[8]<<8)|buf[9]);
 110             /* num_sample_frames */
 111             num_sample_frames = ((buf[10]<<24)|(buf[11]<<16)|(buf[12]<<8)
 112                                 |buf[13]);
 113             /* sample_size */
 114             sample_size  = ((buf[14]<<8)|buf[15]);
 115             /* sample_rate (don't use last 4 bytes, only integer fs) */
 116             if (buf[16] != 0x40) {
 117                 DEBUGF("CODEC_ERROR: weird sampling rate (no @)\n");
 118                 i = CODEC_ERROR;
 119                 goto done;
 120             }
 121             sample_rate = ((buf[18]<<24)|(buf[19]<<16)|(buf[20]<<8)|buf[21])+1;
 122             sample_rate = sample_rate >> (16 + 14 - buf[17]);
 123             /* calc average bytes per second */
 124             avgbytespersec = sample_rate*num_channels*sample_size/8;
 125         } else if (memcmp(buf, "SSND", 4)==0) {
 126             if (sample_size == 0) {
 127                 DEBUGF("CODEC_ERROR: unsupported chunk order\n");
 128                 i = CODEC_ERROR;
 129                 goto done;
 130             }
 131             /* offset2snd */
 132             offset2snd = (buf[8]<<24)|(buf[9]<<16)|(buf[10]<<8)|buf[11];
 133             /* block_size */
 134             block_size = (buf[12]<<24)|(buf[13]<<16)|(buf[14]<<8)|buf[15];
 135             if (block_size == 0)
 136                 block_size = num_channels*sample_size;
 137             numbytes = i - 8 - offset2snd;
 138             i = 8 + offset2snd; /* advance to the beginning of data */
 139         } else {
 140             DEBUGF("unsupported AIFF chunk: '%c%c%c%c', size=%lu\n",
 141                    buf[0], buf[1], buf[2], buf[3], (unsigned long)i);
 142         }
 143
 144         if (i & 0x01) /* odd chunk sizes must be padded */
 145             i++;
 146         buf += i + 8;
 147         if (n < (i + 8)) {
 148             DEBUGF("CODEC_ERROR: AIFF header size > 1024\n");
 149             i = CODEC_ERROR;
 150             goto done;
 151         }
 152         n -= i + 8;
 153     } /* while 'SSND' */
 154
 155     if (num_channels == 0) {
 156         DEBUGF("CODEC_ERROR: 'COMM' chunk not found or 0-channels file\n");
 157         i = CODEC_ERROR;
 158         goto done;
 159     }
 160     if (numbytes == 0) {
 161         DEBUGF("CODEC_ERROR: 'SSND' chunk not found or has zero length\n");
 162         i = CODEC_ERROR;
 163         goto done;
 164     }
 165     if (sample_size > 24) {
 166         DEBUGF("CODEC_ERROR: PCM with more than 24 bits per sample "
 167                "is unsupported\n");
 168         i = CODEC_ERROR;
 169         goto done;
 170     }
 171
 172     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
 173
 174     if (num_channels == 2) {
 175         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
 176     } else if (num_channels == 1) {
 177         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
 178     } else {
 179         DEBUGF("CODEC_ERROR: more than 2 channels unsupported\n");
 180         i = CODEC_ERROR;
 181         goto done;
 182     }
 183
 184     firstblockposn = 1024 - n;
 185     ci->advance_buffer(firstblockposn);
 186
 187     /* The main decoder loop */
 188     bytesdone = 0;
 189     ci->set_elapsed(0);
 190     endofstream = 0;
 191     /* chunksize is computed so that one chunk is about 1/50s.
 192      * this make 4096 for 44.1kHz 16bits stereo.
 193      * It also has to be a multiple of blockalign */
 194     chunksize = (1 + avgbytespersec/(50*block_size))*block_size;
 195     /* check that the output buffer is big enough (convert to samplespersec,
 196       then round to the block_size multiple below) */
 197     if (((uint64_t)chunksize*ci->id3->frequency*num_channels*2)
 198         /(uint64_t)avgbytespersec >= AIF_CHUNK_SIZE) {
 199         chunksize = ((uint64_t)AIF_CHUNK_SIZE*avgbytespersec
 200                      /((uint64_t)ci->id3->frequency*num_channels*2
 201                      *block_size))*block_size;
 202     }
 203
 204     while (!endofstream) {
 205         ci->yield();
 206         if (ci->stop_codec || ci->new_track)
 207             break;
 208
 209         if (ci->seek_time) {
 210             uint32_t newpos;
 211
 212             /* use avgbytespersec to round to the closest blockalign multiple,
 213                add firstblockposn. 64-bit casts to avoid overflows. */
 214             newpos = (((uint64_t)avgbytespersec*(ci->seek_time - 1))
 215                       /(1000LL*block_size))*block_size;
 216             if (newpos > numbytes)
 217                 break;
 218             if (ci->seek_buffer(firstblockposn + newpos))
 219                 bytesdone = newpos;
 220             ci->seek_complete();
 221         }
 222         aifbuf = (uint8_t *)ci->request_buffer(&n, chunksize);
 223
 224         if (n == 0)
 225             break; /* End of stream */
 226
 227         if (bytesdone + n > numbytes) {
 228             n = numbytes - bytesdone;
 229             endofstream = 1;
 230         }
 231
 232         if (sample_size > 24) {
 233             for (i = 0; i < n; i += 4) {
 234                 samples[i/4] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13)
 235                                |(aifbuf[i + 2]<<5)|(aifbuf[i + 3]>>3);
 236             }
 237             bufcount = n >> 2;
 238         } else if (sample_size > 16) {
 239             for (i = 0; i < n; i += 3) {
 240                 samples[i/3] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13)
 241                                |(aifbuf[i + 2]<<5);
 242             }
 243             bufcount = n/3;
 244         } else if (sample_size > 8) {
 245             for (i = 0; i < n; i += 2)
 246                 samples[i/2] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13);
 247             bufcount = n >> 1;
 248         } else {
 249             for (i = 0; i < n; i++)
 250                 samples[i] = SE(aifbuf[i]) << 21;
 251             bufcount = n;
 252         }
 253
 254         if (num_channels == 2)
 255             bufcount >>= 1;
 256
 257         ci->pcmbuf_insert(samples, NULL, bufcount);
 258
 259         ci->advance_buffer(n);
 260         bytesdone += n;
 261         if (bytesdone >= numbytes)
 262             endofstream = 1;
 263
 264         ci->set_elapsed(bytesdone*1000LL/avgbytespersec);
 265     }
 266     i = CODEC_OK;
 267
 268 done:
 269     if (ci->request_next_track())
 270         goto next_track;
 271
 272 exit:
 273     return i;
 274 }
 275