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 RMContext rmctx;
  32 RMPacket pkt;
  33 COOKContext q IBSS_ATTR;
  34 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 = 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(COOKContext));
  64
  65     init_rm(&rmctx);
  66
  67     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  68     /* cook's sample representation is 21.11
  69      * DSP_SET_SAMPLE_DEPTH = 11 (FRACT) + 16 (NATIVE) - 1 (SIGN) = 26 */
  70     ci->configure(DSP_SET_SAMPLE_DEPTH, 26);
  71     ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
  72                   STEREO_MONO : STEREO_NONINTERLEAVED);
  73
  74     packet_count = rmctx.nb_packets;
  75     rmctx.audio_framesize = rmctx.block_align;
  76     rmctx.block_align = rmctx.sub_packet_size;
  77     fs = rmctx.audio_framesize;
  78     sps= rmctx.block_align;
  79     h = rmctx.sub_packet_h;
  80     scrambling_unit_size = h*fs;
  81
  82     res =cook_decode_init(&rmctx, &q);
  83     if(res < 0) {
  84         DEBUGF("failed to initialize cook decoder\n");
  85         return CODEC_ERROR;
  86     }
  87
  88     /* check for a mid-track resume and force a seek time accordingly */
  89     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
  90         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
  91         num_units = (int)resume_offset / scrambling_unit_size;
  92         /* put number of subpackets to skip in resume_offset */
  93         resume_offset /= (sps + PACKET_HEADER_SIZE);
  94         ci->seek_time =  (int)resume_offset * ((sps * 8 * 1000)/rmctx.bit_rate);
  95     }
  96
  97     ci->set_elapsed(0);
  98     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
  99
 100     /* The main decoder loop */
 101 seek_start :
 102     while(packet_count)
 103     {
 104         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 105         consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 106         if(consumed < 0) {
 107             DEBUGF("rm_get_packet failed\n");
 108             return CODEC_ERROR;
 109         }
 110
 111         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
 112         {
 113             ci->yield();
 114             if (ci->stop_codec || ci->new_track)
 115                 goto done;
 116
 117             if (ci->seek_time) {
 118                 ci->set_elapsed(ci->seek_time);
 119
 120                 /* Do not allow seeking beyond the file's length */
 121                 if ((unsigned) ci->seek_time > ci->id3->length) {
 122                     ci->seek_complete();
 123                     goto done;
 124                 }
 125
 126                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 127                 packet_count = rmctx.nb_packets;
 128                 rmctx.audio_pkt_cnt = 0;
 129                 rmctx.frame_number = 0;
 130
 131                 /* Seek to the start of the track */
 132                 if (ci->seek_time == 1) {
 133                     ci->set_elapsed(0);
 134                     ci->seek_complete();
 135                     goto seek_start;
 136                 }
 137                 num_units = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate))/(h*(fs/sps));
 138                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * num_units);
 139                 bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 140                 consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 141                 if(consumed < 0) {
 142                      DEBUGF("rm_get_packet failed\n");
 143                      return CODEC_ERROR;
 144                 }
 145                 packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
 146                 rmctx.frame_number = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate));
 147                 while(rmctx.audiotimestamp > (unsigned) ci->seek_time) {
 148                     rmctx.audio_pkt_cnt = 0;
 149                     ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
 150                     bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 151                     consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 152                     packet_count += rmctx.audio_pkt_cnt;
 153                     num_units--;
 154                 }
 155                 time_offset = ci->seek_time - rmctx.audiotimestamp;
 156                 i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
 157                 ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 158                 ci->seek_complete();
 159             }
 160             res = cook_decode_frame(&rmctx,&q, rm_outbuf, &datasize, pkt.frames[i], rmctx.block_align);
 161             rmctx.frame_number++;
 162
 163             /* skip the first two frames; no valid audio */
 164             if(rmctx.frame_number < 3) continue;
 165
 166             if(res != rmctx.block_align) {
 167                 DEBUGF("codec error\n");
 168                 return CODEC_ERROR;
 169             }
 170
 171             ci->pcmbuf_insert(rm_outbuf,
 172                               rm_outbuf+q.samples_per_channel,
 173                               q.samples_per_channel);
 174             ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 175         }
 176         packet_count -= rmctx.audio_pkt_cnt;
 177         rmctx.audio_pkt_cnt = 0;
 178         ci->advance_buffer(consumed);
 179     }
 180
 181     done :
 182     if (ci->request_next_track())
 183         goto next_track;
 184
 185     return CODEC_OK;
 186 }