apps/codecs/raac.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 "codeclib.h"
  23 #include "librm/rm.h"
  24 #include "libfaad/common.h"
  25 #include "libfaad/structs.h"
  26 #include "libfaad/decoder.h"
  27 /* rockbox: not used
  28 #include "libfaad/output.h"
  29 */
  30
  31 CODEC_HEADER
  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 static RMContext rmctx;
  39 static RMPacket pkt;
  40
  41 /* this is the codec entry point */
  42 enum codec_status codec_main(enum codec_entry_call_reason reason)
  43 {
  44     if (reason == CODEC_LOAD) {
  45         /* Generic codec initialisation */
  46         ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
  47         ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
  48     }
  49
  50     return CODEC_OK;
  51 }
  52
  53 /* this is called for each file to process */
  54 enum codec_status codec_run(void)
  55 {
  56     static NeAACDecFrameInfo frame_info;
  57     NeAACDecHandle decoder;
  58     size_t n;
  59     unsigned int i;
  60     unsigned char* buffer;
  61     int err, consumed, pkt_offset, skipped = 0;
  62     uint32_t s = 0; /* sample rate */
  63     unsigned char c = 0; /* channels */
  64     int playback_on = -1;
  65     size_t resume_offset;
  66     intptr_t param;
  67     enum codec_command_action action = CODEC_ACTION_NULL;
  68
  69     if (codec_init()) {
  70         DEBUGF("FAAD: Codec init error\n");
  71         return CODEC_ERROR;
  72     }
  73
  74     resume_offset = ci->id3->offset;
  75
  76     ci->memset(&rmctx,0,sizeof(RMContext));
  77     ci->memset(&pkt,0,sizeof(RMPacket));
  78
  79     ci->seek_buffer(0);
  80
  81     init_rm(&rmctx);
  82     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
  83     codec_set_replaygain(ci->id3);
  84
  85     /* initialise the sound converter */
  86     decoder = NeAACDecOpen();
  87
  88     if (!decoder) {
  89         DEBUGF("FAAD: Decode open error\n");
  90         return CODEC_ERROR;
  91     }
  92
  93     NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(decoder);
  94     conf->outputFormat = FAAD_FMT_16BIT; /* irrelevant, we don't convert */
  95     NeAACDecSetConfiguration(decoder, conf);
  96
  97     decoder->config.defObjectType = rmctx.codec_extradata[0];
  98     decoder->config.defSampleRate = rmctx.sample_rate;
  99     err = NeAACDecInit(decoder, NULL, 0, &s, &c);
 100
 101     if (err) {
 102         DEBUGF("FAAD: DecInit: %d, %d\n", err, decoder->object_type);
 103         return CODEC_ERROR;
 104     }
 105
 106     /* check for a mid-track resume and force a seek time accordingly */
 107     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
 108         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
 109         /* put number of subpackets to skip in resume_offset */
 110         resume_offset /= (rmctx.block_align + PACKET_HEADER_SIZE);
 111         param = (int)resume_offset * ((rmctx.block_align * 8 * 1000)/rmctx.bit_rate);
 112         action = CODEC_ACTION_SEEK_TIME;
 113     }
 114     ci->set_elapsed(0);
 115     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 116
 117     /* The main decoding loop */
 118     while (1) {
 119         if (action == CODEC_ACTION_NULL)
 120             action = ci->get_command(&param);
 121
 122         if (action == CODEC_ACTION_HALT)
 123             break;
 124
 125         if (action == CODEC_ACTION_SEEK_TIME) {
 126             /* Do not allow seeking beyond the file's length */
 127             if ((unsigned) param > ci->id3->length) {
 128                 ci->set_elapsed(ci->id3->length);
 129                 ci->seek_complete();
 130                 break;
 131             }
 132
 133             ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 134
 135             /* Seek to the start of the track */
 136             if (param == 0) {
 137                 ci->set_elapsed(0);
 138                 ci->seek_complete();
 139                 action = CODEC_ACTION_NULL;
 140                 continue;
 141             }
 142
 143             skipped = 0;
 144             while(1) {
 145                 buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 146                 pkt_offset = skipped - pkt.length;
 147                 consumed = rm_get_packet(&buffer, &rmctx, &pkt);
 148                 if(consumed < 0 && playback_on != 0) {
 149                     if(playback_on == -1) {
 150                     /* Error only if packet-parsing failed and playback hadn't started */
 151                         DEBUGF("rm_get_packet failed\n");
 152                         ci->seek_complete();
 153                         return CODEC_ERROR;
 154                     }
 155                     else {
 156                         ci->seek_complete();
 157                         return CODEC_OK;
 158                     }
 159                 }
 160                 skipped += pkt.length;
 161
 162                 if(pkt.timestamp > (unsigned)param)
 163                     break;
 164
 165                 ci->advance_buffer(pkt.length);
 166             }
 167             ci->seek_buffer(pkt_offset + rmctx.data_offset + DATA_HEADER_SIZE);
 168             buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 169             NeAACDecPostSeekReset(decoder, decoder->frame);
 170             ci->set_elapsed(pkt.timestamp);
 171             ci->seek_complete();
 172         }
 173
 174         action = CODEC_ACTION_NULL;
 175
 176         /* Request the required number of bytes from the input buffer */
 177         buffer=ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 178         consumed = rm_get_packet(&buffer, &rmctx, &pkt);
 179
 180         if(consumed < 0 && playback_on != 0) {
 181             if(playback_on == -1) {
 182             /* Error only if packet-parsing failed and playback hadn't started */
 183                 DEBUGF("rm_get_packet failed\n");
 184                 return CODEC_ERROR;
 185             }
 186             else
 187                 break;
 188         }
 189
 190         playback_on = 1;
 191         if (pkt.timestamp >= ci->id3->length)
 192             break;
 193
 194         /* Decode one block - returned samples will be host-endian */
 195         for(i = 0; i < rmctx.sub_packet_cnt; i++) {
 196             NeAACDecDecode(decoder, &frame_info, buffer, rmctx.sub_packet_lengths[i]);
 197             buffer += rmctx.sub_packet_lengths[i];
 198             if (frame_info.error > 0) {
 199                 DEBUGF("FAAD: decode error '%s'\n", NeAACDecGetErrorMessage(frame_info.error));
 200                 return CODEC_ERROR;
 201             }
 202             ci->pcmbuf_insert(decoder->time_out[0],
 203                               decoder->time_out[1],
 204                               decoder->frameLength);
 205             ci->set_elapsed(pkt.timestamp);
 206         }
 207
 208         ci->advance_buffer(pkt.length);
 209     }
 210
 211     return CODEC_OK;
 212 }