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 #include "libfaad/output.h"
  28
  29 CODEC_HEADER
  30
  31 static void init_rm(RMContext *rmctx)
  32 {
  33     memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
  34 }
  35
  36 RMContext rmctx;
  37 RMPacket pkt;
  38 /* this is the codec entry point */
  39 enum codec_status codec_main(void)
  40 {
  41     static NeAACDecFrameInfo frame_info;
  42     NeAACDecHandle decoder;
  43     size_t n;
  44     int32_t *output;
  45     unsigned int i;
  46     unsigned char* buffer;
  47     int err, consumed, pkt_offset, skipped = 0;
  48     uint32_t s = 0; /* sample rate */
  49     unsigned char c = 0; /* channels */
  50     int playback_on = -1;
  51     size_t resume_offset = ci->id3->offset;
  52
  53     /* Generic codec initialisation */
  54     ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
  55     ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
  56
  57 next_track:
  58     err = CODEC_OK;
  59
  60     if (codec_init()) {
  61         DEBUGF("FAAD: Codec init error\n");
  62         return CODEC_ERROR;
  63     }
  64
  65     while (!*ci->taginfo_ready && !ci->stop_codec)
  66         ci->sleep(1);
  67
  68     ci->memset(&rmctx,0,sizeof(RMContext));
  69     ci->memset(&pkt,0,sizeof(RMPacket));
  70     init_rm(&rmctx);
  71     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
  72     codec_set_replaygain(ci->id3);
  73
  74     /* initialise the sound converter */
  75     decoder = NeAACDecOpen();
  76
  77     if (!decoder) {
  78         DEBUGF("FAAD: Decode open error\n");
  79         err = CODEC_ERROR;
  80         goto done;
  81     }
  82     NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(decoder);
  83     conf->outputFormat = FAAD_FMT_16BIT;
  84     NeAACDecSetConfiguration(decoder, conf);
  85
  86     decoder->config.defObjectType = rmctx.codec_extradata[0];
  87     decoder->config.defSampleRate = rmctx.sample_rate;
  88     err = NeAACDecInit(decoder, NULL, 0, &s, &c);
  89
  90     if (err) {
  91         DEBUGF("FAAD: DecInit: %d, %d\n", err, decoder->object_type);
  92         err = CODEC_ERROR;
  93         goto done;
  94     }
  95
  96     /* check for a mid-track resume and force a seek time accordingly */
  97     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
  98         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
  99         /* put number of subpackets to skip in resume_offset */
 100         resume_offset /= (rmctx.block_align + PACKET_HEADER_SIZE);
 101         ci->seek_time =  (int)resume_offset * ((rmctx.block_align * 8 * 1000)/rmctx.bit_rate);
 102     }
 103
 104     ci->id3->frequency = s;
 105     ci->set_elapsed(0);
 106     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 107
 108     /* The main decoding loop */
 109 seek_start:
 110     while (1) {
 111         ci->yield();
 112         if (ci->stop_codec || ci->new_track) {
 113             break;
 114         }
 115
 116         if (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
 126             /* Seek to the start of the track */
 127             if (ci->seek_time == 1) {
 128                 ci->set_elapsed(0);
 129                 ci->seek_complete();
 130                 goto seek_start;
 131             }
 132
 133             skipped = 0;
 134             while(1) {
 135                 buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 136                 pkt_offset = skipped - pkt.length;
 137                 consumed = rm_get_packet(&buffer, &rmctx, &pkt);
 138                 if(consumed < 0 && playback_on != 0) {
 139                     if(playback_on == -1) {
 140                     /* Error only if packet-parsing failed and playback hadn't started */
 141                         DEBUGF("rm_get_packet failed\n");
 142                         return CODEC_ERROR;
 143                     }
 144                     else
 145                         goto done;
 146                 }
 147                 skipped += pkt.length;
 148                 if(pkt.timestamp > (unsigned)ci->seek_time) break;
 149                 ci->advance_buffer(pkt.length);
 150             }
 151             ci->seek_buffer(pkt_offset + rmctx.data_offset + DATA_HEADER_SIZE);
 152             buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 153             ci->seek_complete();
 154         }
 155
 156         /* Request the required number of bytes from the input buffer */
 157         buffer=ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 158         consumed = rm_get_packet(&buffer, &rmctx, &pkt);
 159
 160         if(consumed < 0 && playback_on != 0) {
 161             if(playback_on == -1) {
 162             /* Error only if packet-parsing failed and playback hadn't started */
 163                 DEBUGF("rm_get_packet failed\n");
 164                 return CODEC_ERROR;
 165             }
 166             else
 167                 goto done;
 168         }
 169
 170         playback_on = 1;
 171         if (pkt.timestamp >= ci->id3->length)
 172             goto done;
 173         /* Decode one block - returned samples will be host-endian */
 174         for(i = 0; i < rmctx.sub_packet_cnt; i++) {
 175             output = (int32_t *)NeAACDecDecode(decoder, &frame_info, buffer, rmctx.sub_packet_lengths[i]);
 176             buffer += rmctx.sub_packet_lengths[i];
 177             if (frame_info.error > 0) {
 178                 DEBUGF("FAAD: decode error '%s'\n", NeAACDecGetErrorMessage(frame_info.error));
 179                 err = CODEC_ERROR;
 180                 goto exit;
 181             }
 182             output = (int32_t *) output_to_PCM(decoder, decoder->time_out, output,
 183                 rmctx.nb_channels, decoder->frameLength, decoder->config.outputFormat);
 184             ci->pcmbuf_insert(output, NULL, frame_info.samples/rmctx.nb_channels);
 185             ci->set_elapsed(pkt.timestamp);
 186         }
 187
 188         ci->advance_buffer(pkt.length);
 189     }
 190
 191     err = CODEC_OK;
 192
 193 done:
 194     if (ci->request_next_track())
 195         goto next_track;
 196
 197 exit:
 198     return err;
 199 }
 200