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     /* initialize the RMContext */
  38     memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
  39
  40     /* and atrac3 expects extadata in id3v2buf, so we shall give it that */
  41     memcpy(ci->id3->id3v2buf, (char*)rmctx->codec_extradata, rmctx->extradata_size*sizeof(char));
  42 }
  43
  44 /* this is the codec entry point */
  45 enum codec_status codec_main(void)
  46 {
  47     static size_t buff_size;
  48     int datasize, res, consumed, i, time_offset;
  49     uint8_t *bit_buffer;
  50     uint16_t fs,sps,h;
  51     uint32_t packet_count;
  52     int scrambling_unit_size, num_units, elapsed = 0;
  53     int playback_on = -1;
  54     size_t resume_offset = ci->id3->offset;
  55
  56 next_track:
  57     if (codec_init()) {
  58         DEBUGF("codec init failed\n");
  59         return CODEC_ERROR;
  60     }
  61     while (!*ci->taginfo_ready && !ci->stop_codec)
  62         ci->sleep(1);
  63
  64     codec_set_replaygain(ci->id3);
  65     ci->memset(&rmctx,0,sizeof(RMContext));
  66     ci->memset(&pkt,0,sizeof(RMPacket));
  67     ci->memset(&q,0,sizeof(ATRAC3Context));
  68
  69     init_rm(&rmctx);
  70
  71     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  72     ci->configure(DSP_SET_SAMPLE_DEPTH, 17); /* Remark: atrac3 uses s15.0 by default, s15.2 was hacked. */
  73     ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
  74         STEREO_MONO : STEREO_NONINTERLEAVED);
  75
  76     packet_count = rmctx.nb_packets;
  77     rmctx.audio_framesize = rmctx.block_align;
  78     rmctx.block_align = rmctx.sub_packet_size;
  79     fs = rmctx.audio_framesize;
  80     sps= rmctx.block_align;
  81     h = rmctx.sub_packet_h;
  82     scrambling_unit_size = h*fs;
  83
  84     res =atrac3_decode_init(&q, ci->id3);
  85     if(res < 0) {
  86         DEBUGF("failed to initialize RM atrac decoder\n");
  87         return CODEC_ERROR;
  88     }
  89
  90     /* check for a mid-track resume and force a seek time accordingly */
  91     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
  92         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
  93         num_units = (int)resume_offset / scrambling_unit_size;
  94         /* put number of subpackets to skip in resume_offset */
  95         resume_offset /= (sps + PACKET_HEADER_SIZE);
  96         ci->seek_time =  (int)resume_offset * ((sps * 8 * 1000)/rmctx.bit_rate);
  97     }
  98
  99     ci->set_elapsed(0);
 100     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 101
 102     /* The main decoder loop */
 103 seek_start :
 104     while((unsigned)elapsed < rmctx.duration)
 105     {
 106         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 107         consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 108         if(consumed < 0 && playback_on != 0) {
 109             if(playback_on == -1) {
 110             /* Error only if packet-parsing failed and playback hadn't started */
 111                 DEBUGF("rm_get_packet failed\n");
 112                 return CODEC_ERROR;
 113             }
 114             else
 115                 goto done;
 116         }
 117
 118         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
 119         {
 120             ci->yield();
 121             if (ci->stop_codec || ci->new_track)
 122                 goto done;
 123
 124             if (ci->seek_time) {
 125                 ci->set_elapsed(ci->seek_time);
 126
 127                 /* Do not allow seeking beyond the file's length */
 128                 if ((unsigned) ci->seek_time > ci->id3->length) {
 129                     ci->seek_complete();
 130                     goto done;
 131                 }
 132
 133                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 134                 packet_count = rmctx.nb_packets;
 135                 rmctx.audio_pkt_cnt = 0;
 136                 rmctx.frame_number = 0;
 137
 138                 /* Seek to the start of the track */
 139                 if (ci->seek_time == 1) {
 140                     ci->set_elapsed(0);
 141                     ci->seek_complete();
 142                     goto seek_start;
 143                 }
 144                 num_units = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate))/(h*(fs/sps));
 145                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * num_units);
 146                 bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 147                 consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 148                 if(consumed < 0 && playback_on != 0) {
 149                     if(playback_on == -1) {
 150                     /* Error only if packet-parsing failed and playback hadn't started */
 151                         DEBUGF("rm_get_packet failed\n");
 152                         return CODEC_ERROR;
 153                     }
 154                     else
 155                         goto done;
 156                 }
 157
 158                 packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
 159                 rmctx.frame_number = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate));
 160                 while(rmctx.audiotimestamp > (unsigned) ci->seek_time) {
 161                     rmctx.audio_pkt_cnt = 0;
 162                     ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
 163                     bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 164                     consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 165                     packet_count += rmctx.audio_pkt_cnt;
 166                     num_units--;
 167                 }
 168                 time_offset = ci->seek_time - rmctx.audiotimestamp;
 169                 i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
 170                 elapsed = rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i;
 171                 ci->set_elapsed(elapsed);
 172                 ci->seek_complete();
 173             }
 174             if(pkt.length)
 175                 res = atrac3_decode_frame(rmctx.block_align, &q, &datasize, pkt.frames[i], rmctx.block_align);
 176             else /* indicates that there are no remaining frames */
 177                 goto done;
 178
 179             if(res != rmctx.block_align) {
 180                 DEBUGF("codec error\n");
 181                 return CODEC_ERROR;
 182             }
 183
 184             if(datasize)
 185                 ci->pcmbuf_insert(q.outSamples, q.outSamples + 1024, q.samples_per_frame / rmctx.nb_channels);
 186             playback_on = 1;
 187             elapsed = rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i;
 188             ci->set_elapsed(elapsed);
 189             rmctx.frame_number++;
 190         }
 191         packet_count -= rmctx.audio_pkt_cnt;
 192         rmctx.audio_pkt_cnt = 0;
 193         ci->advance_buffer(consumed);
 194     }
 195
 196     done :
 197     if (ci->request_next_track())
 198         goto next_track;
 199
 200     return CODEC_OK;
 201 }