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