apps/codecs/atrac3_rm.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2009 Mohamed Tarek
  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 <string.h>
  23
  24 #include "logf.h"
  25 #include "codeclib.h"
  26 #include "inttypes.h"
  27 #include "libatrac/atrac3.h"
  28
  29 CODEC_HEADER
  30
  31 RMContext rmctx;
  32 RMPacket pkt;
  33 ATRAC3Context q IBSS_ATTR;
  34
  35 static void init_rm(RMContext *rmctx)
  36 {
  37     memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
  38 }
  39
  40 /* this is the codec entry point */
  41 enum codec_status codec_main(void)
  42 {
  43     static size_t buff_size;
  44     int datasize, res, consumed, i, time_offset;
  45     uint8_t *bit_buffer;
  46     uint16_t fs,sps,h;
  47     uint32_t packet_count;
  48     int scrambling_unit_size, num_units, elapsed = 0;
  49     int playback_on = -1;
  50     size_t resume_offset = ci->id3->offset;
  51
  52 next_track:
  53     if (codec_init()) {
  54         DEBUGF("codec init failed\n");
  55         return CODEC_ERROR;
  56     }
  57     while (!*ci->taginfo_ready && !ci->stop_codec)
  58         ci->sleep(1);
  59
  60     codec_set_replaygain(ci->id3);
  61     ci->memset(&rmctx,0,sizeof(RMContext));
  62     ci->memset(&pkt,0,sizeof(RMPacket));
  63     ci->memset(&q,0,sizeof(ATRAC3Context));
  64
  65     init_rm(&rmctx);
  66
  67     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  68     ci->configure(DSP_SET_SAMPLE_DEPTH, 17); /* Remark: atrac3 uses s15.0 by default, s15.2 was hacked. */
  69     ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
  70         STEREO_MONO : STEREO_NONINTERLEAVED);
  71
  72     packet_count = rmctx.nb_packets;
  73     rmctx.audio_framesize = rmctx.block_align;
  74     rmctx.block_align = rmctx.sub_packet_size;
  75     fs = rmctx.audio_framesize;
  76     sps= rmctx.block_align;
  77     h = rmctx.sub_packet_h;
  78     scrambling_unit_size = h*fs;
  79
  80     res =atrac3_decode_init(&q, &rmctx);
  81     if(res < 0) {
  82         DEBUGF("failed to initialize atrac decoder\n");
  83         return CODEC_ERROR;
  84     }
  85
  86     /* check for a mid-track resume and force a seek time accordingly */
  87     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
  88         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
  89         num_units = (int)resume_offset / scrambling_unit_size;
  90         /* put number of subpackets to skip in resume_offset */
  91         resume_offset /= (sps + PACKET_HEADER_SIZE);
  92         ci->seek_time =  (int)resume_offset * ((sps * 8 * 1000)/rmctx.bit_rate);
  93     }
  94
  95     ci->set_elapsed(0);
  96     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
  97
  98     /* The main decoder loop */
  99 seek_start :
 100     while((unsigned)elapsed < rmctx.duration)
 101     {
 102         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 103         consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 104         if(consumed < 0 && playback_on != 0) {
 105             if(playback_on == -1) {
 106             /* Error only if packet-parsing failed and playback hadn't started */
 107                 DEBUGF("rm_get_packet failed\n");
 108                 return CODEC_ERROR;
 109             }
 110             else
 111                 goto done;
 112         }
 113
 114         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
 115         {
 116             ci->yield();
 117             if (ci->stop_codec || ci->new_track)
 118                 goto done;
 119
 120             if (ci->seek_time) {
 121                 ci->set_elapsed(ci->seek_time);
 122
 123                 /* Do not allow seeking beyond the file's length */
 124                 if ((unsigned) ci->seek_time > ci->id3->length) {
 125                     ci->seek_complete();
 126                     goto done;
 127                 }
 128
 129                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 130                 packet_count = rmctx.nb_packets;
 131                 rmctx.audio_pkt_cnt = 0;
 132                 rmctx.frame_number = 0;
 133
 134                 /* Seek to the start of the track */
 135                 if (ci->seek_time == 1) {
 136                     ci->set_elapsed(0);
 137                     ci->seek_complete();
 138                     goto seek_start;
 139                 }
 140                 num_units = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate))/(h*(fs/sps));
 141                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * num_units);
 142                 bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 143                 consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 144                 if(consumed < 0 && playback_on != 0) {
 145                     if(playback_on == -1) {
 146                     /* Error only if packet-parsing failed and playback hadn't started */
 147                         DEBUGF("rm_get_packet failed\n");
 148                         return CODEC_ERROR;
 149                     }
 150                     else
 151                         goto done;
 152                 }
 153
 154                 packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
 155                 rmctx.frame_number = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate));
 156                 while(rmctx.audiotimestamp > (unsigned) ci->seek_time) {
 157                     rmctx.audio_pkt_cnt = 0;
 158                     ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
 159                     bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 160                     consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 161                     packet_count += rmctx.audio_pkt_cnt;
 162                     num_units--;
 163                 }
 164                 time_offset = ci->seek_time - rmctx.audiotimestamp;
 165                 i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
 166                 elapsed = rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i;
 167                 ci->set_elapsed(elapsed);
 168                 ci->seek_complete();
 169             }
 170             if(pkt.length)
 171                 res = atrac3_decode_frame(&rmctx, &q, &datasize, pkt.frames[i], rmctx.block_align);
 172             else /* indicates that there are no remaining frames */
 173                 goto done;
 174
 175             if(res != rmctx.block_align) {
 176                 DEBUGF("codec error\n");
 177                 return CODEC_ERROR;
 178             }
 179
 180             if(datasize)
 181                 ci->pcmbuf_insert(q.outSamples, q.outSamples + 1024, q.samples_per_frame / rmctx.nb_channels);
 182             playback_on = 1;
 183             elapsed = rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i;
 184             ci->set_elapsed(elapsed);
 185             rmctx.frame_number++;
 186         }
 187         packet_count -= rmctx.audio_pkt_cnt;
 188         rmctx.audio_pkt_cnt = 0;
 189         ci->advance_buffer(consumed);
 190     }
 191
 192     done :
 193     if (ci->request_next_track())
 194         goto next_track;
 195
 196     return CODEC_OK;
 197 }