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ads.c
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1 /*
2  * ADS/SS2 demuxer
3  * Copyright (c) 2015 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
23 #include "avformat.h"
24 #include "internal.h"
25 
26 static int ads_probe(AVProbeData *p)
27 {
28  if (memcmp(p->buf, "SShd", 4) ||
29  memcmp(p->buf+32, "SSbd", 4))
30  return 0;
31 
32  return AVPROBE_SCORE_MAX / 3 * 2;
33 }
34 
36 {
37  int align, codec, size;
38  AVStream *st;
39 
40  st = avformat_new_stream(s, NULL);
41  if (!st)
42  return AVERROR(ENOMEM);
43 
44  avio_skip(s->pb, 8);
46  codec = avio_rl32(s->pb);
47  st->codecpar->sample_rate = avio_rl32(s->pb);
48  if (st->codecpar->sample_rate <= 0)
49  return AVERROR_INVALIDDATA;
50  st->codecpar->channels = avio_rl32(s->pb);
51  if (st->codecpar->channels <= 0)
52  return AVERROR_INVALIDDATA;
53  align = avio_rl32(s->pb);
54  if (align <= 0 || align > INT_MAX / st->codecpar->channels)
55  return AVERROR_INVALIDDATA;
56 
57  if (codec == 1)
59  else
61 
63  avio_skip(s->pb, 12);
64  size = avio_rl32(s->pb);
66  st->duration = (size - 0x40) / 16 / st->codecpar->channels * 28;
67  avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
68 
69  return 0;
70 }
71 
73 {
74  AVCodecParameters *par = s->streams[0]->codecpar;
75  int ret;
76 
77  ret = av_get_packet(s->pb, pkt, par->block_align);
78  pkt->stream_index = 0;
79  return ret;
80 }
81 
83  .name = "ads",
84  .long_name = NULL_IF_CONFIG_SMALL("Sony PS2 ADS"),
85  .read_probe = ads_probe,
86  .read_header = ads_read_header,
87  .read_packet = ads_read_packet,
88  .extensions = "ads,ss2",
89 };
AVInputFormat ff_ads_demuxer
Definition: ads.c:82
#define NULL
Definition: coverity.c:32
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4882
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3900
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:331
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3892
static int ads_probe(AVProbeData *p)
Definition: ads.c:26
Format I/O context.
Definition: avformat.h:1351
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4455
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
static int ads_read_header(AVFormatContext *s)
Definition: ads.c:35
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
ptrdiff_t size
Definition: opengl_enc.c:101
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:770
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3896
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
int block_align
Audio only.
Definition: avcodec.h:4017
audio channel layout utility functions
#define s(width, name)
Definition: cbs_vp9.c:257
Stream structure.
Definition: avformat.h:874
const AVS_VideoInfo int align
Definition: avisynth_c.h:795
AVIOContext * pb
I/O context.
Definition: avformat.h:1393
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:923
int sample_rate
Audio only.
Definition: avcodec.h:4010
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:460
Main libavformat public API header.
static int ads_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ads.c:72
int channels
Audio only.
Definition: avcodec.h:4006
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
int stream_index
Definition: avcodec.h:1447
This structure stores compressed data.
Definition: avcodec.h:1422