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 CODEC_HEADER
  28
  29 RMContext rmctx;
  30 RMPacket pkt;
  31 COOKContext q IBSS_ATTR;
  32
  33 static void init_rm(RMContext *rmctx)
  34 {
  35     memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
  36 }
  37
  38 /* this is the codec entry point */
  39 enum codec_status codec_main(void)
  40 {
  41     static size_t buff_size;
  42     int datasize, res, consumed, i, time_offset;
  43     uint8_t *bit_buffer;
  44     int16_t outbuf[2048] __attribute__((aligned(32)));
  45     uint16_t fs,sps,h;
  46     uint32_t packet_count;
  47     int scrambling_unit_size, num_units;
  48     size_t resume_offset = ci->id3->offset;
  49
  50 next_track:
  51     if (codec_init()) {
  52         DEBUGF("codec init failed\n");
  53         return CODEC_ERROR;
  54     }
  55     while (!*ci->taginfo_ready && !ci->stop_codec)
  56         ci->sleep(1);
  57
  58     codec_set_replaygain(ci->id3);
  59     ci->memset(&rmctx,0,sizeof(RMContext));
  60     ci->memset(&pkt,0,sizeof(RMPacket));
  61     ci->memset(&q,0,sizeof(COOKContext));
  62
  63     init_rm(&rmctx);
  64
  65     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  66     ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
  67     ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
  68                   STEREO_MONO : STEREO_INTERLEAVED);
  69
  70     packet_count = rmctx.nb_packets;
  71     rmctx.audio_framesize = rmctx.block_align;
  72     rmctx.block_align = rmctx.sub_packet_size;
  73     fs = rmctx.audio_framesize;
  74     sps= rmctx.block_align;
  75     h = rmctx.sub_packet_h;
  76     scrambling_unit_size = h*fs;
  77
  78     res =cook_decode_init(&rmctx, &q);
  79     if(res < 0) {
  80         DEBUGF("failed to initialize cook decoder\n");
  81         return CODEC_ERROR;
  82     }
  83
  84     /* check for a mid-track resume and force a seek time accordingly */
  85     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
  86         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
  87         num_units = (int)resume_offset / scrambling_unit_size;
  88         /* put number of subpackets to skip in resume_offset */
  89         resume_offset /= (sps + PACKET_HEADER_SIZE);
  90         ci->seek_time =  (int)resume_offset * ((sps * 8 * 1000)/rmctx.bit_rate);
  91     }
  92
  93     ci->set_elapsed(0);
  94     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
  95
  96     /* The main decoder loop */
  97 seek_start :
  98     while(packet_count)
  99     {
 100         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 101         consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 102         if(consumed < 0) {
 103             DEBUGF("rm_get_packet failed\n");
 104             return CODEC_ERROR;
 105         }
 106
 107         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
 108         {
 109             ci->yield();
 110             if (ci->stop_codec || ci->new_track)
 111                 goto done;
 112
 113             if (ci->seek_time) {
 114                 ci->set_elapsed(ci->seek_time);
 115
 116                 /* Do not allow seeking beyond the file's length */
 117                 if ((unsigned) ci->seek_time > ci->id3->length) {
 118                     ci->seek_complete();
 119                     goto done;
 120                 }
 121
 122                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 123                 packet_count = rmctx.nb_packets;
 124                 rmctx.audio_pkt_cnt = 0;
 125                 rmctx.frame_number = 0;
 126
 127                 /* Seek to the start of the track */
 128                 if (ci->seek_time == 1) {
 129                     ci->set_elapsed(0);
 130                     ci->seek_complete();
 131                     goto seek_start;
 132                 }
 133                 num_units = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate))/(h*(fs/sps));
 134                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * num_units);
 135                 bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 136                 consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 137                 if(consumed < 0) {
 138                      DEBUGF("rm_get_packet failed\n");
 139                      return CODEC_ERROR;
 140                 }
 141                 packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
 142                 rmctx.frame_number = ((ci->seek_time)/(sps*1000*8/rmctx.bit_rate));
 143                 while(rmctx.audiotimestamp > (unsigned) ci->seek_time) {
 144                     rmctx.audio_pkt_cnt = 0;
 145                     ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
 146                     bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 147                     consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 148                     packet_count += rmctx.audio_pkt_cnt;
 149                     num_units--;
 150                 }
 151                 time_offset = ci->seek_time - rmctx.audiotimestamp;
 152                 i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
 153                 ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 154                 ci->seek_complete();
 155             }
 156             res = cook_decode_frame(&rmctx,&q, outbuf, &datasize, pkt.frames[i], rmctx.block_align);
 157             rmctx.frame_number++;
 158
 159             /* skip the first two frames; no valid audio */
 160             if(rmctx.frame_number < 3) continue;
 161
 162             if(res != rmctx.block_align) {
 163                 DEBUGF("codec error\n");
 164                 return CODEC_ERROR;
 165             }
 166
 167             ci->pcmbuf_insert(outbuf, NULL, q.samples_per_frame / rmctx.nb_channels);
 168             ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 169         }
 170         packet_count -= rmctx.audio_pkt_cnt;
 171         rmctx.audio_pkt_cnt = 0;
 172         ci->advance_buffer(consumed);
 173     }
 174
 175     done :
 176     if (ci->request_next_track())
 177         goto next_track;
 178
 179     return CODEC_OK;
 180 }