FFmpeg  4.4.5
ipudec.c
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1 /*
2  * IPU video demuxer
3  * Copyright (c) 2020 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 "avformat.h"
23 #include "internal.h"
24 #include "avio_internal.h"
25 #include "rawdec.h"
26 
27 #include "libavutil/intreadwrite.h"
28 #include "libavcodec/internal.h"
29 
30 static int ipu_read_probe(const AVProbeData *p)
31 {
32  if (AV_RB32(p->buf) != MKBETAG('i', 'p', 'u', 'm'))
33  return 0;
34 
35  if (AV_RL32(p->buf + 4) == 0)
36  return 0;
37 
38  if (AV_RL16(p->buf + 8) == 0)
39  return 0;
40 
41  if (AV_RL16(p->buf + 10) == 0)
42  return 0;
43 
44  if (AV_RL32(p->buf + 12) == 0)
45  return 0;
46 
47  return AVPROBE_SCORE_MAX;
48 }
49 
51 {
52  AVIOContext *pb = s->pb;
54 
55  if (!st)
56  return AVERROR(ENOMEM);
57  avio_skip(pb, 8);
60  st->codecpar->width = avio_rl16(pb);
61  st->codecpar->height = avio_rl16(pb);
62  st->start_time = 0;
63  st->duration =
64  st->nb_frames = avio_rl32(pb);
66  avpriv_set_pts_info(st, 64, 1, 25);
67 
68  return 0;
69 }
70 
71 static const AVClass ipu_demuxer_class = {
72  .class_name = "ipu demuxer",
73  .item_name = av_default_item_name,
74  .option = ff_raw_options,
75  .version = LIBAVUTIL_VERSION_INT,
76 };
77 
79  .name = "ipu",
80  .long_name = NULL_IF_CONFIG_SMALL("raw IPU Video"),
81  .read_probe = ipu_read_probe,
82  .read_header = ipu_read_header,
83  .read_packet = ff_raw_read_partial_packet,
84  .extensions = "ipu",
85  .flags = AVFMT_GENERIC_INDEX,
86  .raw_codec_id = AV_CODEC_ID_IPU,
87  .priv_data_size = sizeof(FFRawDemuxerContext),
88  .priv_class = &ipu_demuxer_class,
89 };
Main libavformat public API header.
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
@ AVSTREAM_PARSE_FULL_RAW
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:798
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
#define AV_RL16
Definition: intreadwrite.h:42
#define AV_RB32
Definition: intreadwrite.h:130
#define AV_RL32
Definition: intreadwrite.h:146
#define s(width, name)
Definition: cbs_vp9.c:257
#define MKBETAG(a, b, c, d)
Definition: common.h:479
#define NULL
Definition: coverity.c:32
@ AV_CODEC_ID_IPU
Definition: codec_id.h:305
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
#define AVERROR(e)
Definition: error.h:43
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
static int ipu_read_header(AVFormatContext *s)
Definition: ipudec.c:50
AVInputFormat ff_ipu_demuxer
Definition: ipudec.c:78
static int ipu_read_probe(const AVProbeData *p)
Definition: ipudec.c:30
static const AVClass ipu_demuxer_class
Definition: ipudec.c:71
common internal api header.
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:4945
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawdec.c:35
const AVOption ff_raw_options[]
Definition: rawdec.c:128
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
int width
Video only.
Definition: codec_par.h:126
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:912
enum AVStreamParseType need_parsing
Definition: avformat.h:1081