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(enum codec_entry_call_reason reason)
  43 {
  44     /* Nothing to do */
  45     return CODEC_OK;
  46     (void)reason;
  47 }
  48
  49 /* this is called for each file to process */
  50 enum codec_status codec_run(void)
  51 {
  52     static size_t buff_size;
  53     int datasize, res, consumed, i, time_offset;
  54     uint8_t *bit_buffer;
  55     uint16_t fs,sps,h;
  56     uint32_t packet_count;
  57     int scrambling_unit_size, num_units;
  58     size_t resume_offset;
  59     intptr_t param = 0;
  60     enum codec_command_action action = CODEC_ACTION_NULL;
  61
  62     if (codec_init()) {
  63         DEBUGF("codec init failed\n");
  64         return CODEC_ERROR;
  65     }
  66
  67     resume_offset = ci->id3->offset;
  68
  69     codec_set_replaygain(ci->id3);
  70     ci->memset(&rmctx,0,sizeof(RMContext));
  71     ci->memset(&pkt,0,sizeof(RMPacket));
  72     ci->memset(&q,0,sizeof(COOKContext));
  73
  74     ci->seek_buffer(0);
  75
  76     init_rm(&rmctx);
  77
  78     ci->configure(DSP_SET_FREQUENCY, ci->id3->frequency);
  79     /* cook's sample representation is 21.11
  80      * DSP_SET_SAMPLE_DEPTH = 11 (FRACT) + 16 (NATIVE) - 1 (SIGN) = 26 */
  81     ci->configure(DSP_SET_SAMPLE_DEPTH, 26);
  82     ci->configure(DSP_SET_STEREO_MODE, rmctx.nb_channels == 1 ?
  83                   STEREO_MONO : STEREO_NONINTERLEAVED);
  84
  85     packet_count = rmctx.nb_packets;
  86     rmctx.audio_framesize = rmctx.block_align;
  87     rmctx.block_align = rmctx.sub_packet_size;
  88     fs = rmctx.audio_framesize;
  89     sps= rmctx.block_align;
  90     h = rmctx.sub_packet_h;
  91     scrambling_unit_size = h*fs;
  92
  93     res =cook_decode_init(&rmctx, &q);
  94     if(res < 0) {
  95         DEBUGF("failed to initialize cook decoder\n");
  96         return CODEC_ERROR;
  97     }
  98
  99     /* check for a mid-track resume and force a seek time accordingly */
 100     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
 101         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
 102         num_units = (int)resume_offset / scrambling_unit_size;
 103         /* put number of subpackets to skip in resume_offset */
 104         resume_offset /= (sps + PACKET_HEADER_SIZE);
 105         param = (int)resume_offset * ((sps * 8 * 1000)/rmctx.bit_rate);
 106         action = CODEC_ACTION_SEEK_TIME;
 107     }
 108
 109     ci->set_elapsed(0);
 110     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 111
 112     /* The main decoder loop */
 113 seek_start :
 114     while(packet_count)
 115     {
 116         bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 117         consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 118         if(consumed < 0) {
 119             DEBUGF("rm_get_packet failed\n");
 120             return CODEC_ERROR;
 121         }
 122
 123         for(i = 0; i < rmctx.audio_pkt_cnt*(fs/sps) ; i++)
 124         {
 125             if (action == CODEC_ACTION_NULL)
 126                 action = ci->get_command(&param);
 127
 128             if (action == CODEC_ACTION_HALT)
 129                 return CODEC_OK;
 130
 131             if (action == CODEC_ACTION_SEEK_TIME) {
 132                 /* Do not allow seeking beyond the file's length */
 133                 if ((unsigned) param > ci->id3->length) {
 134                     ci->set_elapsed(ci->id3->length);
 135                     ci->seek_complete();
 136                     return CODEC_OK;
 137                 }
 138
 139                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 140                 packet_count = rmctx.nb_packets;
 141                 rmctx.audio_pkt_cnt = 0;
 142                 rmctx.frame_number = 0;
 143
 144                 /* Seek to the start of the track */
 145                 if (param == 0) {
 146                     ci->set_elapsed(0);
 147                     ci->seek_complete();
 148                     action = CODEC_ACTION_NULL;
 149                     goto seek_start;
 150                 }
 151                 num_units = (param/(sps*1000*8/rmctx.bit_rate))/(h*(fs/sps));
 152                 ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * num_units);
 153                 bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 154                 consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 155                 if(consumed < 0) {
 156                      DEBUGF("rm_get_packet failed\n");
 157                     ci->seek_complete();
 158                     return CODEC_ERROR;
 159                 }
 160                 packet_count = rmctx.nb_packets - rmctx.audio_pkt_cnt * num_units;
 161                 rmctx.frame_number = (param/(sps*1000*8/rmctx.bit_rate));
 162                 while(rmctx.audiotimestamp > (unsigned) param) {
 163                     rmctx.audio_pkt_cnt = 0;
 164                     ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + consumed * (num_units-1));
 165                     bit_buffer = (uint8_t *) ci->request_buffer(&buff_size, scrambling_unit_size);
 166                     consumed = rm_get_packet(&bit_buffer, &rmctx, &pkt);
 167                     packet_count += rmctx.audio_pkt_cnt;
 168                     num_units--;
 169                 }
 170                 time_offset = param - rmctx.audiotimestamp;
 171                 i = (time_offset/((sps * 8 * 1000)/rmctx.bit_rate));
 172                 ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 173                 ci->seek_complete();
 174             }
 175
 176             action = CODEC_ACTION_NULL;
 177
 178             res = cook_decode_frame(&rmctx,&q, rm_outbuf, &datasize, pkt.frames[i], rmctx.block_align);
 179             rmctx.frame_number++;
 180
 181             /* skip the first two frames; no valid audio */
 182             if(rmctx.frame_number < 3) continue;
 183
 184             if(res != rmctx.block_align) {
 185                 DEBUGF("codec error\n");
 186                 return CODEC_ERROR;
 187             }
 188
 189             ci->pcmbuf_insert(rm_outbuf,
 190                               rm_outbuf+q.samples_per_channel,
 191                               q.samples_per_channel);
 192             ci->set_elapsed(rmctx.audiotimestamp+(1000*8*sps/rmctx.bit_rate)*i);
 193         }
 194         packet_count -= rmctx.audio_pkt_cnt;
 195         rmctx.audio_pkt_cnt = 0;
 196         ci->advance_buffer(consumed);
 197     }
 198
 199     return CODEC_OK;
 200 }