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 /* Global buffers to be used in the mdct synthesis. This way the arrays can
  32  * be moved to IRAM for some targets */
  33 #define GB_BUF_SIZE 1024
  34 static ALIGN real_t gb_time_buffer[2][GB_BUF_SIZE] IBSS_ATTR_FAAD_LARGE_IRAM;
  35 static ALIGN real_t gb_fb_intermed[2][GB_BUF_SIZE] IBSS_ATTR_FAAD_LARGE_IRAM;
  36
  37
  38 static void init_rm(RMContext *rmctx)
  39 {
  40     memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
  41 }
  42
  43 static RMContext rmctx;
  44 static RMPacket pkt;
  45 /* this is the codec entry point */
  46 enum codec_status codec_main(void)
  47 {
  48     static NeAACDecFrameInfo frame_info;
  49     NeAACDecHandle decoder;
  50     size_t n;
  51     void *ret;
  52     int needed_bufsize;
  53     unsigned int i;
  54     unsigned char* buffer;
  55     int err, consumed, pkt_offset, skipped = 0;
  56     uint32_t s = 0; /* sample rate */
  57     unsigned char c = 0; /* channels */
  58     int playback_on = -1;
  59     size_t resume_offset = ci->id3->offset;
  60
  61     /* Generic codec initialisation */
  62     ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
  63     ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
  64
  65 next_track:
  66     err = CODEC_OK;
  67
  68     if (codec_init()) {
  69         DEBUGF("FAAD: Codec init error\n");
  70         return CODEC_ERROR;
  71     }
  72
  73     while (!*ci->taginfo_ready && !ci->stop_codec)
  74         ci->sleep(1);
  75
  76     ci->memset(&rmctx,0,sizeof(RMContext));
  77     ci->memset(&pkt,0,sizeof(RMPacket));
  78     init_rm(&rmctx);
  79     ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
  80     codec_set_replaygain(ci->id3);
  81
  82     /* initialise the sound converter */
  83     decoder = NeAACDecOpen();
  84
  85     if (!decoder) {
  86         DEBUGF("FAAD: Decode open error\n");
  87         err = CODEC_ERROR;
  88         goto done;
  89     }
  90     NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(decoder);
  91     conf->outputFormat = FAAD_FMT_16BIT; /* irrelevant, we don't convert */
  92     NeAACDecSetConfiguration(decoder, conf);
  93
  94     decoder->config.defObjectType = rmctx.codec_extradata[0];
  95     decoder->config.defSampleRate = rmctx.sample_rate;
  96     err = NeAACDecInit(decoder, NULL, 0, &s, &c);
  97
  98     if (err) {
  99         DEBUGF("FAAD: DecInit: %d, %d\n", err, decoder->object_type);
 100         err = CODEC_ERROR;
 101         goto done;
 102     }
 103
 104     /* Set pointer to be able to use IRAM an to avoid alloc in decoder. Must
 105      * be called after NeAACDecOpen(). */
 106     /* A buffer of framelength or 2*frameLenght size must be allocated for
 107      * time_out. If frameLength is too big or SBR/forceUpSampling is active,
 108      * we do not use the IRAM buffer and keep faad's internal allocation (see
 109      * specrec.c). */
 110     needed_bufsize = decoder->frameLength;
 111 #ifdef SBR_DEC
 112     if ((decoder->sbr_present_flag == 1) || (decoder->forceUpSampling == 1))
 113     {
 114         needed_bufsize *= 2;
 115     }
 116 #endif
 117     if (needed_bufsize <= GB_BUF_SIZE)
 118     {
 119         decoder->time_out[0]    = &gb_time_buffer[0][0];
 120         decoder->time_out[1]    = &gb_time_buffer[1][0];
 121     }
 122     /* A buffer of with frameLength elements must be allocated for fb_intermed.
 123      * If frameLength is too big, we do not use the IRAM buffer and keep faad's
 124      * internal allocation (see specrec.c). */
 125     needed_bufsize = decoder->frameLength;
 126     if (needed_bufsize <= GB_BUF_SIZE)
 127     {
 128         decoder->fb_intermed[0] = &gb_fb_intermed[0][0];
 129         decoder->fb_intermed[1] = &gb_fb_intermed[1][0];
 130     }
 131
 132     /* check for a mid-track resume and force a seek time accordingly */
 133     if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
 134         resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
 135         /* put number of subpackets to skip in resume_offset */
 136         resume_offset /= (rmctx.block_align + PACKET_HEADER_SIZE);
 137         ci->seek_time =  (int)resume_offset * ((rmctx.block_align * 8 * 1000)/rmctx.bit_rate);
 138     }
 139
 140     ci->id3->frequency = s;
 141     ci->set_elapsed(0);
 142     ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 143
 144     /* The main decoding loop */
 145 seek_start:
 146     while (1) {
 147         ci->yield();
 148         if (ci->stop_codec || ci->new_track) {
 149             break;
 150         }
 151
 152         if (ci->seek_time) {
 153
 154             /* Do not allow seeking beyond the file's length */
 155             if ((unsigned) ci->seek_time > ci->id3->length) {
 156                 ci->seek_complete();
 157                 goto done;
 158             }
 159
 160             ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
 161
 162             /* Seek to the start of the track */
 163             if (ci->seek_time == 1) {
 164                 ci->set_elapsed(0);
 165                 ci->seek_complete();
 166                 goto seek_start;
 167             }
 168
 169             skipped = 0;
 170             while(1) {
 171                 buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 172                 pkt_offset = skipped - pkt.length;
 173                 consumed = rm_get_packet(&buffer, &rmctx, &pkt);
 174                 if(consumed < 0 && playback_on != 0) {
 175                     if(playback_on == -1) {
 176                     /* Error only if packet-parsing failed and playback hadn't started */
 177                         DEBUGF("rm_get_packet failed\n");
 178                         return CODEC_ERROR;
 179                     }
 180                     else
 181                         goto done;
 182                 }
 183                 skipped += pkt.length;
 184                 if(pkt.timestamp > (unsigned)ci->seek_time) break;
 185                 ci->advance_buffer(pkt.length);
 186             }
 187             ci->seek_buffer(pkt_offset + rmctx.data_offset + DATA_HEADER_SIZE);
 188             buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 189             ci->seek_complete();
 190         }
 191
 192         /* Request the required number of bytes from the input buffer */
 193         buffer=ci->request_buffer(&n,rmctx.audio_framesize + 1000);
 194         consumed = rm_get_packet(&buffer, &rmctx, &pkt);
 195
 196         if(consumed < 0 && playback_on != 0) {
 197             if(playback_on == -1) {
 198             /* Error only if packet-parsing failed and playback hadn't started */
 199                 DEBUGF("rm_get_packet failed\n");
 200                 return CODEC_ERROR;
 201             }
 202             else
 203                 goto done;
 204         }
 205
 206         playback_on = 1;
 207         if (pkt.timestamp >= ci->id3->length)
 208             goto done;
 209         /* Decode one block - returned samples will be host-endian */
 210         for(i = 0; i < rmctx.sub_packet_cnt; i++) {
 211             ret = NeAACDecDecode(decoder, &frame_info, buffer, rmctx.sub_packet_lengths[i]);
 212             buffer += rmctx.sub_packet_lengths[i];
 213             if (frame_info.error > 0) {
 214                 DEBUGF("FAAD: decode error '%s'\n", NeAACDecGetErrorMessage(frame_info.error));
 215                 err = CODEC_ERROR;
 216                 goto exit;
 217             }
 218             ci->pcmbuf_insert(decoder->time_out[0],
 219                               decoder->time_out[1],
 220                               decoder->frameLength);
 221             ci->set_elapsed(pkt.timestamp);
 222         }
 223
 224         ci->advance_buffer(pkt.length);
 225     }
 226
 227     err = CODEC_OK;
 228
 229 done:
 230     if (ci->request_next_track())
 231         goto next_track;
 232
 233 exit:
 234     return err;
 235 }
 236