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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 "avformat.h"
  28. #include "internal.h"
  29.  
  30. #define BLOCK_SIZE    18
  31. #define BLOCK_SAMPLES 32
  32.  
  33. typedef struct ADXDemuxerContext {
  34.     int header_size;
  35. } ADXDemuxerContext;
  36.  
  37. static int adx_read_packet(AVFormatContext *s, AVPacket *pkt)
  38. {
  39.     ADXDemuxerContext *c = s->priv_data;
  40.     AVCodecContext *avctx = s->streams[0]->codec;
  41.     int ret, size;
  42.  
  43.     if (avctx->channels <= 0) {
  44.         av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", avctx->channels);
  45.         return AVERROR_INVALIDDATA;
  46.     }
  47.  
  48.     size = BLOCK_SIZE * avctx->channels;
  49.  
  50.     pkt->pos = avio_tell(s->pb);
  51.     pkt->stream_index = 0;
  52.  
  53.     ret = av_get_packet(s->pb, pkt, size);
  54.     if (ret != size) {
  55.         av_free_packet(pkt);
  56.         return ret < 0 ? ret : AVERROR(EIO);
  57.     }
  58.     if (AV_RB16(pkt->data) & 0x8000) {
  59.         av_free_packet(pkt);
  60.         return AVERROR_EOF;
  61.     }
  62.     pkt->size     = size;
  63.     pkt->duration = 1;
  64.     pkt->pts      = (pkt->pos - c->header_size) / size;
  65.  
  66.     return 0;
  67. }
  68.  
  69. static int adx_read_header(AVFormatContext *s)
  70. {
  71.     ADXDemuxerContext *c = s->priv_data;
  72.     AVCodecContext *avctx;
  73.  
  74.     AVStream *st = avformat_new_stream(s, NULL);
  75.     if (!st)
  76.         return AVERROR(ENOMEM);
  77.     avctx = s->streams[0]->codec;
  78.  
  79.     if (avio_rb16(s->pb) != 0x8000)
  80.         return AVERROR_INVALIDDATA;
  81.     c->header_size = avio_rb16(s->pb) + 4;
  82.     avio_seek(s->pb, -4, SEEK_CUR);
  83.  
  84.     if (ff_get_extradata(avctx, s->pb, c->header_size) < 0)
  85.         return AVERROR(ENOMEM);
  86.  
  87.     if (avctx->extradata_size < 12) {
  88.         av_log(s, AV_LOG_ERROR, "Invalid extradata size.\n");
  89.         return AVERROR_INVALIDDATA;
  90.     }
  91.     avctx->channels    = AV_RB8(avctx->extradata + 7);
  92.     avctx->sample_rate = AV_RB32(avctx->extradata + 8);
  93.  
  94.     if (avctx->channels <= 0) {
  95.         av_log(s, AV_LOG_ERROR, "invalid number of channels %d\n", avctx->channels);
  96.         return AVERROR_INVALIDDATA;
  97.     }
  98.  
  99.     st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  100.     st->codec->codec_id    = s->iformat->raw_codec_id;
  101.  
  102.     avpriv_set_pts_info(st, 64, BLOCK_SAMPLES, avctx->sample_rate);
  103.  
  104.     return 0;
  105. }
  106.  
  107. AVInputFormat ff_adx_demuxer = {
  108.     .name           = "adx",
  109.     .long_name      = NULL_IF_CONFIG_SMALL("CRI ADX"),
  110.     .priv_data_size = sizeof(ADXDemuxerContext),
  111.     .read_header    = adx_read_header,
  112.     .read_packet    = adx_read_packet,
  113.     .extensions     = "adx",
  114.     .raw_codec_id   = AV_CODEC_ID_ADPCM_ADX,
  115.     .flags          = AVFMT_GENERIC_INDEX,
  116. };
  117.