2 * Copyright (c) 2011 Justin Ruggles
4 * This file is part of FFmpeg.
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.
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.
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
26 #include "libavutil/intreadwrite.h"
31 #define BLOCK_SAMPLES 32
33 typedef struct ADXDemuxerContext
{
37 static int adx_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
39 ADXDemuxerContext
*c
= s
->priv_data
;
40 AVCodecContext
*avctx
= s
->streams
[0]->codec
;
43 size
= BLOCK_SIZE
* avctx
->channels
;
45 pkt
->pos
= avio_tell(s
->pb
);
46 pkt
->stream_index
= 0;
48 ret
= av_get_packet(s
->pb
, pkt
, size
);
51 return ret
< 0 ? ret
: AVERROR(EIO
);
53 if (AV_RB16(pkt
->data
) & 0x8000) {
59 pkt
->pts
= (pkt
->pos
- c
->header_size
) / size
;
64 static int adx_read_header(AVFormatContext
*s
)
66 ADXDemuxerContext
*c
= s
->priv_data
;
67 AVCodecContext
*avctx
;
69 AVStream
*st
= avformat_new_stream(s
, NULL
);
71 return AVERROR(ENOMEM
);
72 avctx
= s
->streams
[0]->codec
;
74 if (avio_rb16(s
->pb
) != 0x8000)
75 return AVERROR_INVALIDDATA
;
76 c
->header_size
= avio_rb16(s
->pb
) + 4;
77 avio_seek(s
->pb
, -4, SEEK_CUR
);
79 if (ff_get_extradata(avctx
, s
->pb
, c
->header_size
) < 0)
80 return AVERROR(ENOMEM
);
82 if (avctx
->extradata_size
< 12) {
83 av_log(s
, AV_LOG_ERROR
, "Invalid extradata size.\n");
84 return AVERROR_INVALIDDATA
;
86 avctx
->sample_rate
= AV_RB32(avctx
->extradata
+ 8);
88 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
89 st
->codec
->codec_id
= s
->iformat
->raw_codec_id
;
91 avpriv_set_pts_info(st
, 64, BLOCK_SAMPLES
, avctx
->sample_rate
);
96 AVInputFormat ff_adx_demuxer
= {
98 .long_name
= NULL_IF_CONFIG_SMALL("CRI ADX"),
99 .priv_data_size
= sizeof(ADXDemuxerContext
),
100 .read_header
= adx_read_header
,
101 .read_packet
= adx_read_packet
,
103 .raw_codec_id
= AV_CODEC_ID_ADPCM_ADX
,
104 .flags
= AVFMT_GENERIC_INDEX
,