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
  70 next_track:
  71     if (codec_init()) {
  72         i = CODEC_ERROR;
  73         goto exit;
  74     }
  75
  76     while (!*ci->taginfo_ready && !ci->stop_codec)
  77         ci->sleep(1);
  78
  79     codec_set_replaygain(ci->id3);
  80
  81     /* assume the AIFF header is less than 1024 bytes */
  82     buf = ci->request_buffer(&n, 1024);
  83     if (n < 54) {
  84         i = CODEC_ERROR;
  85         goto done;
  86     }
  87     if ((memcmp(buf, "FORM", 4) != 0) || (memcmp(&buf[8], "AIFF", 4) != 0)) {
  88         i = CODEC_ERROR;
  89         goto done;
  90     }
  91
  92     buf += 12;
  93     n -= 12;
  94     numbytes = 0;
  95
  96     /* read until 'SSND' chunk, which typically is last */
  97     while (numbytes == 0 && n >= 8) {
  98         /* chunkSize */
  99         i = ((buf[4]<<24)|(buf[5]<<16)|(buf[6]<<8)|buf[7]);
 100         if (memcmp(buf, "COMM", 4) == 0) {
 101             if (i < 18) {
 102                 DEBUGF("CODEC_ERROR: 'COMM' chunk size=%lu < 18\n",
 103                        (unsigned long)i);
 104                 i = CODEC_ERROR;
 105                 goto done;
 106             }
 107             /* num_channels */
 108             num_channels = ((buf[8]<<8)|buf[9]);
 109             /* num_sample_frames */
 110             num_sample_frames = ((buf[10]<<24)|(buf[11]<<16)|(buf[12]<<8)
 111                                 |buf[13]);
 112             /* sample_size */
 113             sample_size  = ((buf[14]<<8)|buf[15]);
 114             /* sample_rate (don't use last 4 bytes, only integer fs) */
 115             if (buf[16] != 0x40) {
 116                 DEBUGF("CODEC_ERROR: weird sampling rate (no @)\n");
 117                 i = CODEC_ERROR;
 118                 goto done;
 119             }
 120             sample_rate = ((buf[18]<<24)|(buf[19]<<16)|(buf[20]<<8)|buf[21])+1;
 121             sample_rate = sample_rate >> (16 + 14 - buf[17]);
 122             /* calc average bytes per second */
 123             avgbytespersec = sample_rate*num_channels*sample_size/8;
 124         } else if (memcmp(buf, "SSND", 4)==0) {
 125             if (sample_size == 0) {
 126                 DEBUGF("CODEC_ERROR: unsupported chunk order\n");
 127                 i = CODEC_ERROR;
 128                 goto done;
 129             }
 130             /* offset2snd */
 131             offset2snd = (buf[8]<<24)|(buf[9]<<16)|(buf[10]<<8)|buf[11];
 132             /* block_size */
 133             block_size = (buf[12]<<24)|(buf[13]<<16)|(buf[14]<<8)|buf[15];
 134             if (block_size == 0)
 135                 block_size = num_channels*sample_size;
 136             numbytes = i - 8 - offset2snd;
 137             i = 8 + offset2snd; /* advance to the beginning of data */
 138         } else {
 139             DEBUGF("unsupported AIFF chunk: '%c%c%c%c', size=%lu\n",
 140                    buf[0], buf[1], buf[2], buf[3], (unsigned long)i);
 141         }
 142
 143         if (i & 0x01) /* odd chunk sizes must be padded */
 144             i++;
 145         buf += i + 8;
 146         if (n < (i + 8)) {
 147             DEBUGF("CODEC_ERROR: AIFF header size > 1024\n");
 148             i = CODEC_ERROR;
 149             goto done;
 150         }
 151         n -= i + 8;
 152     } /* while 'SSND' */
 153
 154     if (num_channels == 0) {
 155         DEBUGF("CODEC_ERROR: 'COMM' chunk not found or 0-channels file\n");
 156         i = CODEC_ERROR;
 157         goto done;
 158     }
 159     if (numbytes == 0) {
 160         DEBUGF("CODEC_ERROR: 'SSND' chunk not found or has zero length\n");
 161         i = CODEC_ERROR;
 162         goto done;
 163     }
 164     if (sample_size > 24) {
 165         DEBUGF("CODEC_ERROR: PCM with more than 24 bits per sample "
 166                "is unsupported\n");
 167         i = CODEC_ERROR;
 168         goto done;
 169     }
 170
 171     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
 172
 173     if (num_channels == 2) {
 174         ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
 175     } else if (num_channels == 1) {
 176         ci->configure(DSP_SET_STEREO_MODE, STEREO_MONO);
 177     } else {
 178         DEBUGF("CODEC_ERROR: more than 2 channels unsupported\n");
 179         i = CODEC_ERROR;
 180         goto done;
 181     }
 182
 183     firstblockposn = 1024 - n;
 184     ci->advance_buffer(firstblockposn);
 185
 186     /* The main decoder loop */
 187     bytesdone = 0;
 188     ci->set_elapsed(0);
 189     endofstream = 0;
 190     /* chunksize is computed so that one chunk is about 1/50s.
 191      * this make 4096 for 44.1kHz 16bits stereo.
 192      * It also has to be a multiple of blockalign */
 193     chunksize = (1 + avgbytespersec/(50*block_size))*block_size;
 194     /* check that the output buffer is big enough (convert to samplespersec,
 195       then round to the block_size multiple below) */
 196     if (((uint64_t)chunksize*ci->id3->frequency*num_channels*2)
 197         /(uint64_t)avgbytespersec >= AIF_CHUNK_SIZE) {
 198         chunksize = ((uint64_t)AIF_CHUNK_SIZE*avgbytespersec
 199                      /((uint64_t)ci->id3->frequency*num_channels*2
 200                      *block_size))*block_size;
 201     }
 202
 203     while (!endofstream) {
 204         ci->yield();
 205         if (ci->stop_codec || ci->new_track)
 206             break;
 207
 208         if (ci->seek_time) {
 209             uint32_t newpos;
 210
 211             /* use avgbytespersec to round to the closest blockalign multiple,
 212                add firstblockposn. 64-bit casts to avoid overflows. */
 213             newpos = (((uint64_t)avgbytespersec*(ci->seek_time - 1))
 214                       /(1000LL*block_size))*block_size;
 215             if (newpos > numbytes)
 216                 break;
 217             if (ci->seek_buffer(firstblockposn + newpos))
 218                 bytesdone = newpos;
 219             ci->seek_complete();
 220         }
 221         aifbuf = (uint8_t *)ci->request_buffer(&n, chunksize);
 222
 223         if (n == 0)
 224             break; /* End of stream */
 225
 226         if (bytesdone + n > numbytes) {
 227             n = numbytes - bytesdone;
 228             endofstream = 1;
 229         }
 230
 231         if (sample_size > 24) {
 232             for (i = 0; i < n; i += 4) {
 233                 samples[i/4] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13)
 234                                |(aifbuf[i + 2]<<5)|(aifbuf[i + 3]>>3);
 235             }
 236             bufcount = n >> 2;
 237         } else if (sample_size > 16) {
 238             for (i = 0; i < n; i += 3) {
 239                 samples[i/3] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13)
 240                                |(aifbuf[i + 2]<<5);
 241             }
 242             bufcount = n/3;
 243         } else if (sample_size > 8) {
 244             for (i = 0; i < n; i += 2)
 245                 samples[i/2] = (SE(aifbuf[i])<<21)|(aifbuf[i + 1]<<13);
 246             bufcount = n >> 1;
 247         } else {
 248             for (i = 0; i < n; i++)
 249                 samples[i] = SE(aifbuf[i]) << 21;
 250             bufcount = n;
 251         }
 252
 253         if (num_channels == 2)
 254             bufcount >>= 1;
 255
 256         ci->pcmbuf_insert(samples, NULL, bufcount);
 257
 258         ci->advance_buffer(n);
 259         bytesdone += n;
 260         if (bytesdone >= numbytes)
 261             endofstream = 1;
 262
 263         ci->set_elapsed(bytesdone*1000LL/avgbytespersec);
 264     }
 265     i = CODEC_OK;
 266
 267 done:
 268     if (ci->request_next_track())
 269         goto next_track;
 270
 271 exit:
 272     return i;
 273 }
 274