apps/codecs/atrac3_rm.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * Copyright (C) 2009 Mohamed Tarek
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  16  * KIND, either express or implied.
  17  *
  18  ****************************************************************************/
  19
  20 #include <string.h>
  21
  22 #include "logf.h"
  23 #include "codeclib.h"
  24 #include "inttypes.h"
  25 #include "libatrac/atrac3.h"
  26
  27 CODEC_HEADER
  28
  29 RMContext rmctx;
  30 RMPacket pkt;
  31 ATRAC3Context q IBSS_ATTR;
  32
  33 static void init_rm(RMContext *rmctx)
  34 {
  35     memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
  36 }
  37
  38 /* this is the codec entry point */
  39 enum codec_status codec_main(void)
  40 {
  41     static size_t buff_size;
  42     int datasize, res, consumed, i, time_offset;
  43     uint8_t *bit_buffer;
  44     uint16_t fs,sps,h;
  45     uint32_t packet_count;
  46     int scrambling_unit_size, num_units, elapsed = 0;
  47     int playback_on = -1;
  48
  49 next_track:
  50     if (codec_init()) {
  51         DEBUGF("codec init failed\n");
  52         return CODEC_ERROR;
  53     }
  54     while (!*ci->taginfo_ready && !ci->stop_codec)
  55         ci->sleep(1);
  56
  57     codec_set_replaygain(ci->id3);
  58     ci->memset(&rmctx,0,sizeof(RMContext));
  59     ci->memset(&pkt,0,sizeof(RMPacket));
  60     ci->memset(&q,0,sizeof(ATRAC3Context));
  61
  62     init_rm(&rmctx);
  63
  64     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  65     ci->configure(DSP_SET_SAMPLE_DEPTH, 17); /* Remark: atrac3 uses s15.0 by default, s15.2 was hacked. */
  66     ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
  67         STEREO_MONO : STEREO_NONINTERLEAVED);
  68
  69     packet_count = rmctx.nb_packets;
  70     rmctx.audio_framesize = rmctx.block_align;
  71     rmctx.block_align = rmctx.sub_packet_size;
  72     fs = rmctx.audio_framesize;
  73     sps= rmctx.block_align;
  74     h = rmctx.sub_packet_h;
  75     scrambling_unit_size = h*fs;
  76
  77     res =atrac3_decode_init(&q, &rmctx);
  78     if(res < 0) {
  79         DEBUGF("failed to initialize atrac decoder\n");
  80         return CODEC_ERROR;
  81     }
  82
  83     ci->set_elapsed(0);
  84     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
  85
  86     /* The main decoder loop */
  87 seek_start :
  88     while((unsigned)elapsed < rmctx.duration)
  89     {
  90         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
  91         consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
  92         if(consumed < 0 && playback_on != 0) {
  93             if(playback_on == -1) {
  94             /* Error only if packet-parsing failed and playback hadn't started */
  95                 DEBUGF("rm_get_packet failed\n");
  96                 return CODEC_ERROR;
  97             }
  98             else
  99                 goto done;
 100         }
 101
 102         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
 103         {
 104             ci->yield();
 105             if (ci->stop_codec || ci->new_track)
 106                 goto done;
 107
 108             if (ci->seek_time) {
 109                 ci->set_elapsed(ci->seek_time);
 110
 111                 /* Do not allow seeking beyond the file's length */
 112                 if ((unsigned) ci->seek_time > ci->id3->length) {
 113                     ci->seek_complete();
 114                     goto done;
 115                 }
 116
 117                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 118                 packet_count = rmctx.nb_packets;
 119                 rmctx.audio_pkt_cnt = 0;
 120                 rmctx.frame_number = 0;
 121
 122                 /* Seek to the start of the track */
 123                 if (ci->seek_time == 1) {
 124                     ci->set_elapsed(0);
 125                     ci->seek_complete();
 126                     goto seek_start;
 127                 }
 128                 num_units = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate))/(h*(fs/sps));
 129                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * num_units);
 130                 bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 131                 consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 132                 if(consumed < 0 && playback_on != 0) {
 133                     if(playback_on == -1) {
 134                     /* Error only if packet-parsing failed and playback hadn't started */
 135                         DEBUGF("rm_get_packet failed\n");
 136                         return CODEC_ERROR;
 137                     }
 138                     else
 139                         goto done;
 140                 }
 141
 142                 packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
 143                 rmctx.frame_number = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate));
 144                 while(rmctx.audiotimestamp > (unsigned) ci->seek_time) {
 145                     rmctx.audio_pkt_cnt = 0;
 146                     ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
 147                     bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 148                     consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 149                     packet_count += rmctx.audio_pkt_cnt;
 150                     num_units--;
 151                 }
 152                 time_offset = ci->seek_time - rmctx.audiotimestamp;
 153                 i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
 154                 elapsed = rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i;
 155                 ci->set_elapsed(elapsed);
 156                 ci->seek_complete();
 157             }
 158             if(pkt.length)
 159                 res = atrac3_decode_frame(&rmctx, &q, &datasize, pkt.frames[i], rmctx.block_align);
 160             else /* indicates that there are no remaining frames */
 161                 goto done;
 162
 163             if(res != rmctx.block_align) {
 164                 DEBUGF("codec error\n");
 165                 return CODEC_ERROR;
 166             }
 167
 168             if(datasize)
 169                 ci->pcmbuf_insert(q.outSamples, q.outSamples + 1024, q.samples_per_frame / rmctx.nb_channels);
 170             playback_on = 1;
 171             elapsed = rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i;
 172             ci->set_elapsed(elapsed);
 173             rmctx.frame_number++;
 174         }
 175         packet_count -= rmctx.audio_pkt_cnt;
 176         rmctx.audio_pkt_cnt = 0;
 177         ci->advance_buffer(consumed);
 178     }
 179
 180     done :
 181     if (ci->request_next_track())
 182         goto next_track;
 183
 184     return CODEC_OK;
 185 }