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