FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
xvag.c
Go to the documentation of this file.
1 /*
2  * XVAG 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 
22 #include "libavutil/bswap.h"
23 #include "avformat.h"
24 #include "internal.h"
25 
26 static int xvag_probe(AVProbeData *p)
27 {
28  if (memcmp(p->buf, "XVAG", 4) ||
29  memcmp(p->buf+32, "fmat", 4))
30  return 0;
31 
32  return AVPROBE_SCORE_MAX;
33 }
34 
36 {
37  unsigned offset, big_endian, codec;
38  AVStream *st;
39 
40  avio_skip(s->pb, 4);
41 
42  st = avformat_new_stream(s, NULL);
43  if (!st)
44  return AVERROR(ENOMEM);
45 
47 
48  offset = avio_rl32(s->pb);
49  big_endian = offset > av_bswap32(offset);
50  if (big_endian) {
51  offset = av_bswap32(offset);
52  avio_skip(s->pb, 28);
53  codec = avio_rb32(s->pb);
54  st->codec->channels = avio_rb32(s->pb);
55  avio_skip(s->pb, 4);
56  st->duration = avio_rb32(s->pb);
57  avio_skip(s->pb, 8);
58  st->codec->sample_rate = avio_rb32(s->pb);
59  } else {
60  avio_skip(s->pb, 28);
61  codec = avio_rl32(s->pb);
62  st->codec->channels = avio_rl32(s->pb);
63  avio_skip(s->pb, 4);
64  st->duration = avio_rl32(s->pb);
65  avio_skip(s->pb, 8);
66  st->codec->sample_rate = avio_rl32(s->pb);
67  }
68 
69  if (st->codec->sample_rate <= 0)
70  return AVERROR_INVALIDDATA;
71  if (st->codec->channels <= 0)
72  return AVERROR_INVALIDDATA;
73 
74  switch (codec) {
75  case 0x1c:
77  st->codec->block_align = 16 * st->codec->channels;
78  break;
79  default:
80  avpriv_request_sample(s, "codec %X", codec);
81  return AVERROR_PATCHWELCOME;
82  };
83 
84  avio_skip(s->pb, offset - avio_tell(s->pb));
85 
86  if (avio_rb16(s->pb) == 0xFFFB) {
88  st->codec->block_align = 0x1000;
90  }
91 
92  avio_skip(s->pb, -2);
93  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
94 
95  return 0;
96 }
97 
99 {
100  AVCodecContext *codec = s->streams[0]->codec;
101 
102  return av_get_packet(s->pb, pkt, codec->block_align);
103 }
104 
106  .name = "xvag",
107  .long_name = NULL_IF_CONFIG_SMALL("Sony PS3 XVAG"),
108  .read_probe = xvag_probe,
109  .read_header = xvag_read_header,
110  .read_packet = xvag_read_packet,
111  .extensions = "xvag",
112 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
#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:4149
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:282
static AVPacket pkt
unsigned int avio_rb16(AVIOContext *s)
Definition: aviobuf.c:683
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
Definition: avcodec.h:2324
static int xvag_probe(AVProbeData *p)
Definition: xvag.c:26
Format I/O context.
Definition: avformat.h:1314
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:698
enum AVStreamParseType need_parsing
Definition: avformat.h:1069
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3805
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1382
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:252
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:442
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:811
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:667
#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:176
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:420
static const uint8_t offset[127][2]
Definition: vf_spp.c:92
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:896
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:462
Stream structure.
Definition: avformat.h:877
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static int xvag_read_header(AVFormatContext *s)
Definition: xvag.c:35
#define av_bswap32
Definition: bswap.h:33
enum AVMediaType codec_type
Definition: avcodec.h:1540
enum AVCodecID codec_id
Definition: avcodec.h:1549
int sample_rate
samples per second
Definition: avcodec.h:2287
AVIOContext * pb
I/O context.
Definition: avformat.h:1356
main external API structure.
Definition: avcodec.h:1532
byte swapping routines
static int xvag_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: xvag.c:98
This structure contains the data a format has to probe a file.
Definition: avformat.h:460
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:936
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:472
Main libavformat public API header.
int channels
number of audio channels
Definition: avcodec.h:2288
AVInputFormat ff_xvag_demuxer
Definition: xvag.c:105
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
This structure stores compressed data.
Definition: avcodec.h:1444