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
  52     /* Generic codec initialisation */
  53     ci->configure(DSP_SET_STEREO_MODE, STEREO_INTERLEAVED);
  54     ci->configure(DSP_SET_SAMPLE_DEPTH, 16);
  55
  56 next_track:
  57     err = CODEC_OK;
  58
  59     if (codec_init()) {
  60         DEBUGF("FAAD: Codec init error\n");
  61         return CODEC_ERROR;
  62     }
  63
  64     while (!*ci->taginfo_ready && !ci->stop_codec)
  65         ci->sleep(1);
  66
  67     ci->memset(&rmctx,0,sizeof(RMContext));
  68     ci->memset(&pkt,0,sizeof(RMPacket));
  69     init_rm(&rmctx);
  70     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
  71     codec_set_replaygain(ci->id3);
  72
  73     /* initialise the sound converter */
  74     decoder = NeAACDecOpen();
  75
  76     if (!decoder) {
  77         DEBUGF("FAAD: Decode open error\n");
  78         err = CODEC_ERROR;
  79         goto done;
  80     }
  81     NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(decoder);
  82     conf->outputFormat = FAAD_FMT_16BIT;
  83     NeAACDecSetConfiguration(decoder, conf);
  84
  85     decoder->config.defObjectType = rmctx.codec_extradata[0];
  86     decoder->config.defSampleRate = rmctx.sample_rate;
  87     err = NeAACDecInit(decoder, NULL, 0, &s, &c);
  88
  89     if (err) {
  90         DEBUGF("FAAD: DecInit: %d, %d\n", err, decoder->object_type);
  91         err = CODEC_ERROR;
  92         goto done;
  93     }
  94     ci->id3->frequency = s;
  95     ci->set_elapsed(0);
  96     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
  97
  98     /* The main decoding loop */
  99 seek_start:
 100     while (1) {
 101         ci->yield();
 102         if (ci->stop_codec || ci->new_track) {
 103             break;
 104         }
 105
 106         if (ci->seek_time) {
 107
 108             /* Do not allow seeking beyond the file's length */
 109             if ((unsigned) ci->seek_time > ci->id3->length) {
 110                 ci->seek_complete();
 111                 goto done;
 112             }
 113
 114             ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 115
 116             /* Seek to the start of the track */
 117             if (ci->seek_time == 1) {
 118                 ci->set_elapsed(0);
 119                 ci->seek_complete();
 120                 goto seek_start;
 121             }
 122
 123             skipped = 0;
 124             while(1) {
 125                 buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 126                 pkt_offset = skipped - pkt.length;
 127                 consumed = rm_get_packet(&buffer, &rmctx, &pkt);
 128                 if(consumed < 0 && playback_on != 0) {
 129                     if(playback_on == -1) {
 130                     /* Error only if packet-parsing failed and playback hadn't started */
 131                         DEBUGF("rm_get_packet failed\n");
 132                         return CODEC_ERROR;
 133                     }
 134                     else
 135                         goto done;
 136                 }
 137                 skipped += pkt.length;
 138                 if(pkt.timestamp > (unsigned)ci->seek_time) break;
 139                 ci->advance_buffer(pkt.length);
 140             }
 141             ci->seek_buffer(pkt_offset + rmctx.data_offset + DATA_HEADER_SIZE);
 142             buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 143             ci->seek_complete();
 144         }
 145
 146         /* Request the required number of bytes from the input buffer */
 147         buffer=ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 148         consumed = rm_get_packet(&buffer, &rmctx, &pkt);
 149
 150         if(consumed < 0 && playback_on != 0) {
 151             if(playback_on == -1) {
 152             /* Error only if packet-parsing failed and playback hadn't started */
 153                 DEBUGF("rm_get_packet failed\n");
 154                 return CODEC_ERROR;
 155             }
 156             else
 157                 goto done;
 158         }
 159
 160         playback_on = 1;
 161         if (pkt.timestamp >= ci->id3->length)
 162             goto done;
 163         /* Decode one block - returned samples will be host-endian */
 164         for(i = 0; i < rmctx.sub_packet_cnt; i++) {
 165             output = (int32_t *)NeAACDecDecode(decoder, &frame_info, buffer, rmctx.sub_packet_lengths[i]);
 166             buffer += rmctx.sub_packet_lengths[i];
 167             if (frame_info.error > 0) {
 168                 DEBUGF("FAAD: decode error '%s'\n", NeAACDecGetErrorMessage(frame_info.error));
 169                 err = CODEC_ERROR;
 170                 goto exit;
 171             }
 172             output = (int32_t *) output_to_PCM(decoder, decoder->time_out, output,
 173                 rmctx.nb_channels, decoder->frameLength, decoder->config.outputFormat);
 174             ci->pcmbuf_insert(output, NULL, frame_info.samples/rmctx.nb_channels);
 175             ci->set_elapsed(pkt.timestamp);
 176         }
 177
 178         ci->advance_buffer(pkt.length);
 179     }
 180
 181     err = CODEC_OK;
 182
 183 done:
 184     if (ci->request_next_track())
 185         goto next_track;
 186
 187 exit:
 188     return err;
 189 }
 190