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  1. /*
  2.  * Copyright (c) 2011 Justin Ruggles
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. /**
  22.  * @file
  23.  * CRI ADX demuxer
  24.  */
  25.  
  26. #include "libavutil/intreadwrite.h"
  27. #include "libavcodec/adx.h"
  28. #include "avformat.h"
  29. #include "internal.h"
  30.  
  31. #define BLOCK_SIZE    18
  32. #define BLOCK_SAMPLES 32
  33.  
  34. typedef struct ADXDemuxerContext {
  35.     int header_size;
  36. } ADXDemuxerContext;
  37.  
  38. static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
  39. {
  40.     ADXDemuxerContext *c = s->priv_data;
  41.     AVCodecContext *avctx = s->streams[0]->codec;
  42.     int ret, size;
  43.  
  44.     size = BLOCK_SIZE * avctx->channels;
  45.  
  46.     pkt->pos = avio_tell(s->pb);
  47.     pkt->stream_index = 0;
  48.  
  49.     ret = av_get_packet(s->pb, pkt, size);
  50.     if (ret != size) {
  51.         av_free_packet(pkt);
  52.         return ret < 0 ? ret : AVERROR(EIO);
  53.     }
  54.     if (AV_RB16(pkt->data) & 0x8000) {
  55.         av_free_packet(pkt);
  56.         return AVERROR_EOF;
  57.     }
  58.     pkt->size     = size;
  59.     pkt->duration = 1;
  60.     pkt->pts      = (pkt->pos - c->header_size) / size;
  61.  
  62.     return 0;
  63. }
  64.  
  65. static int adx_read_header(AVFormatContext *s)
  66. {
  67.     ADXDemuxerContext *c = s->priv_data;
  68.     AVCodecContext *avctx;
  69.     int ret;
  70.  
  71.     AVStream *st = avformat_new_stream(s, NULL);
  72.     if (!st)
  73.         return AVERROR(ENOMEM);
  74.     avctx = s->streams[0]->codec;
  75.  
  76.     if (avio_rb16(s->pb) != 0x8000)
  77.         return AVERROR_INVALIDDATA;
  78.     c->header_size = avio_rb16(s->pb) + 4;
  79.     avio_seek(s->pb, -4, SEEK_CUR);
  80.  
  81.     if (ff_alloc_extradata(avctx, c->header_size))
  82.         return AVERROR(ENOMEM);
  83.     if (avio_read(s->pb, avctx->extradata, c->header_size) < c->header_size) {
  84.         av_freep(&avctx->extradata);
  85.         return AVERROR(EIO);
  86.     }
  87.     avctx->extradata_size = c->header_size;
  88.  
  89.     ret = avpriv_adx_decode_header(avctx, avctx->extradata,
  90.                                    avctx->extradata_size, &c->header_size,
  91.                                    NULL);
  92.     if (ret)
  93.         return ret;
  94.  
  95.     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  96.     st->codec->codec_id    = s->iformat->raw_codec_id;
  97.  
  98.     avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);
  99.  
  100.     return 0;
  101. }
  102.  
  103. AVInputFormat ff_adx_demuxer = {
  104.     .name           = "adx",
  105.     .long_name      = NULL_IF_CONFIG_SMALL("CRI ADX"),
  106.     .priv_data_size = sizeof(ADXDemuxerContext),
  107.     .read_header    = adx_read_header,
  108.     .read_packet    = adx_read_packet,
  109.     .extensions     = "adx",
  110.     .raw_codec_id   = AV_CODEC_ID_ADPCM_ADX,
  111.     .flags          = AVFMT_GENERIC_INDEX,
  112. };
  113.