apps/codecs/cook.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 "libcook/cook.h"
  26
  27 #define DATA_HEADER_SIZE 18 /* size of DATA chunk header in a rm file */
  28
  29 CODEC_HEADER
  30
  31 RMContext rmctx;
  32 RMPacket pkt;
  33 COOKContext 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     int16_t outbuf[2048] __attribute__((aligned(32)));
  47     uint16_t fs,sps,h;
  48     uint32_t packet_count;
  49     int scrambling_unit_size, num_units;
  50
  51 next_track:
  52     if (codec_init()) {
  53         DEBUGF("codec init failed\n");
  54         return CODEC_ERROR;
  55     }
  56     while (!*ci->taginfo_ready && !ci->stop_codec)
  57         ci->sleep(1);
  58
  59     codec_set_replaygain(ci->id3);
  60     ci->memset(&rmctx,0,sizeof(RMContext));
  61     ci->memset(&pkt,0,sizeof(RMPacket));
  62     ci->memset(&q,0,sizeof(COOKContext));
  63
  64     init_rm(&rmctx);
  65
  66     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  67     ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
  68     ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
  69                   STEREO_MONO : STEREO_INTERLEAVED);
  70
  71     packet_count = rmctx.nb_packets;
  72     rmctx.audio_framesize = rmctx.block_align;
  73     rmctx.block_align = rmctx.sub_packet_size;
  74     fs = rmctx.audio_framesize;
  75     sps= rmctx.block_align;
  76     h = rmctx.sub_packet_h;
  77     scrambling_unit_size = h*fs;
  78
  79     res =cook_decode_init(&rmctx, &q);
  80     if(res < 0) {
  81         DEBUGF("failed to initialize cook decoder\n");
  82         return CODEC_ERROR;
  83     }
  84
  85     ci->set_elapsed(0);
  86     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
  87
  88     /* The main decoder loop */
  89 seek_start :
  90     while(packet_count)
  91     {
  92         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
  93         consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
  94         if(consumed < 0) {
  95             DEBUGF("rm_get_packet failed\n");
  96             return CODEC_ERROR;
  97         }
  98
  99         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
 100         {
 101             ci->yield();
 102             if (ci->stop_codec || ci->new_track)
 103                 goto done;
 104
 105             if (ci->seek_time) {
 106                 ci->set_elapsed(ci->seek_time);
 107
 108                 /* Do not allow seeking beyond the file's length */
 109                 if ((unsigned) ci->seek_time > ci->id3->length) {
 110                     ci->seek_complete();
 111                     goto done;
 112                 }
 113
 114                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 115                 packet_count = rmctx.nb_packets;
 116                 rmctx.audio_pkt_cnt = 0;
 117                 rmctx.frame_number = 0;
 118
 119                 /* Seek to the start of the track */
 120                 if (ci->seek_time == 1) {
 121                     ci->set_elapsed(0);
 122                     ci->seek_complete();
 123                     goto seek_start;
 124                 }
 125                 num_units = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate))/(h*(fs/sps));
 126                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * num_units);
 127                 bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 128                 consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 129                 if(consumed < 0) {
 130                      DEBUGF("rm_get_packet failed\n");
 131                      return CODEC_ERROR;
 132                 }
 133                 packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
 134                 rmctx.frame_number = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate));
 135                 while(rmctx.audiotimestamp > (unsigned) ci->seek_time) {
 136                     rmctx.audio_pkt_cnt = 0;
 137                     ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
 138                     bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 139                     consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 140                     packet_count += rmctx.audio_pkt_cnt;
 141                     num_units--;
 142                 }
 143                 time_offset = ci->seek_time - rmctx.audiotimestamp;
 144                 i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
 145                 ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 146                 ci->seek_complete();
 147             }
 148             res = cook_decode_frame(&rmctx,&q, outbuf, &datasize, pkt.frames[i], rmctx.block_align);
 149             rmctx.frame_number++;
 150
 151             /* skip the first two frames; no valid audio */
 152             if(rmctx.frame_number < 3) continue;
 153
 154             if(res != rmctx.block_align) {
 155                 DEBUGF("codec error\n");
 156                 return CODEC_ERROR;
 157             }
 158
 159             ci->pcmbuf_insert(outbuf, NULL, q.samples_per_frame / rmctx.nb_channels);
 160             ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 161         }
 162         packet_count -= rmctx.audio_pkt_cnt;
 163         rmctx.audio_pkt_cnt = 0;
 164         ci->advance_buffer(consumed);
 165     }
 166
 167     done :
 168     if (ci->request_next_track())
 169         goto next_track;
 170
 171     return CODEC_OK;
 172 }