apps/codecs/cook.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 "libcook/cook.h"
  28
  29 CODEC_HEADER
  30
  31 static RMContext rmctx;
  32 static RMPacket pkt;
  33 static COOKContext q IBSS_ATTR;
  34 static int32_t rm_outbuf[2048];
  35
  36 static void init_rm(RMContext *rmctx)
  37 {
  38     memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
  39 }
  40
  41 /* this is the codec entry point */
  42 enum codec_status codec_main(void)
  43 {
  44     static size_t buff_size;
  45     int datasize, res, consumed, i, time_offset;
  46     uint8_t *bit_buffer;
  47     uint16_t fs,sps,h;
  48     uint32_t packet_count;
  49     int scrambling_unit_size, num_units;
  50     size_t resume_offset;
  51
  52 next_track:
  53     if (codec_init()) {
  54         DEBUGF("codec init failed\n");
  55         return CODEC_ERROR;
  56     }
  57
  58     if (codec_wait_taginfo() != 0)
  59         goto done;
  60
  61     resume_offset = ci->id3->offset;
  62
  63     codec_set_replaygain(ci->id3);
  64     ci->memset(&rmctx,0,sizeof(RMContext));
  65     ci->memset(&pkt,0,sizeof(RMPacket));
  66     ci->memset(&q,0,sizeof(COOKContext));
  67
  68     init_rm(&rmctx);
  69
  70     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  71     /* cook's sample representation is 21.11
  72      * DSP_SET_SAMPLE_DEPTH = 11 (FRACT) + 16 (NATIVE) - 1 (SIGN) = 26 */
  73     ci->configure(DSP_SET_SAMPLE_DEPTH, 26);
  74     ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
  75                   STEREO_MONO : STEREO_NONINTERLEAVED);
  76
  77     packet_count = rmctx.nb_packets;
  78     rmctx.audio_framesize = rmctx.block_align;
  79     rmctx.block_align = rmctx.sub_packet_size;
  80     fs = rmctx.audio_framesize;
  81     sps= rmctx.block_align;
  82     h = rmctx.sub_packet_h;
  83     scrambling_unit_size = h*fs;
  84
  85     res =cook_decode_init(&rmctx, &q);
  86     if(res < 0) {
  87         DEBUGF("failed to initialize cook decoder\n");
  88         return CODEC_ERROR;
  89     }
  90
  91     /* check for a mid-track resume and force a seek time accordingly */
  92     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
  93         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
  94         num_units = (int)resume_offset / scrambling_unit_size;
  95         /* put number of subpackets to skip in resume_offset */
  96         resume_offset /= (sps + PACKET_HEADER_SIZE);
  97         ci->seek_time =  (int)resume_offset * ((sps * 8 * 1000)/rmctx.bit_rate);
  98     }
  99
 100     ci->set_elapsed(0);
 101     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 102
 103     /* The main decoder loop */
 104 seek_start :
 105     while(packet_count)
 106     {
 107         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 108         consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 109         if(consumed < 0) {
 110             DEBUGF("rm_get_packet failed\n");
 111             return CODEC_ERROR;
 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) {
 145                      DEBUGF("rm_get_packet failed\n");
 146                      return CODEC_ERROR;
 147                 }
 148                 packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
 149                 rmctx.frame_number = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate));
 150                 while(rmctx.audiotimestamp > (unsigned) ci->seek_time) {
 151                     rmctx.audio_pkt_cnt = 0;
 152                     ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
 153                     bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 154                     consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 155                     packet_count += rmctx.audio_pkt_cnt;
 156                     num_units--;
 157                 }
 158                 time_offset = ci->seek_time - rmctx.audiotimestamp;
 159                 i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
 160                 ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 161                 ci->seek_complete();
 162             }
 163             res = cook_decode_frame(&rmctx,&q, rm_outbuf, &datasize, pkt.frames[i], rmctx.block_align);
 164             rmctx.frame_number++;
 165
 166             /* skip the first two frames; no valid audio */
 167             if(rmctx.frame_number < 3) continue;
 168
 169             if(res != rmctx.block_align) {
 170                 DEBUGF("codec error\n");
 171                 return CODEC_ERROR;
 172             }
 173
 174             ci->pcmbuf_insert(rm_outbuf,
 175                               rm_outbuf+q.samples_per_channel,
 176                               q.samples_per_channel);
 177             ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 178         }
 179         packet_count -= rmctx.audio_pkt_cnt;
 180         rmctx.audio_pkt_cnt = 0;
 181         ci->advance_buffer(consumed);
 182     }
 183
 184     done :
 185     if (ci->request_next_track())
 186         goto next_track;
 187
 188     return CODEC_OK;
 189 }