FFmpeg
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 
72  .name = "ipu",
73  .long_name = NULL_IF_CONFIG_SMALL("raw IPU Video"),
74  .read_probe = ipu_read_probe,
75  .read_header = ipu_read_header,
76  .read_packet = ff_raw_read_partial_packet,
77  .extensions = "ipu",
78  .flags = AVFMT_GENERIC_INDEX,
79  .raw_codec_id = AV_CODEC_ID_IPU,
80  .priv_data_size = sizeof(FFRawDemuxerContext),
81  .priv_class = &ff_raw_demuxer_class,
82 };
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4347
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
internal.h
AVStream::internal
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1009
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
FFRawDemuxerContext
Definition: rawdec.h:36
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:890
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:726
AVInputFormat
Definition: avformat.h:626
ff_raw_read_partial_packet
int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawdec.c:34
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
ff_raw_demuxer_class
const AVClass ff_raw_demuxer_class
Definition: rawdec.c:140
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:994
NULL
#define NULL
Definition: coverity.c:32
rawdec.h
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:892
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:742
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
AV_CODEC_ID_IPU
@ AV_CODEC_ID_IPU
Definition: codec_id.h:305
avpriv_set_pts_info
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:4771
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:96
avio_internal.h
ipu_read_probe
static int ipu_read_probe(const AVProbeData *p)
Definition: ipudec.c:30
AVCodecParameters::height
int height
Definition: codec_par.h:127
AVStream
Stream structure.
Definition: avformat.h:847
AVStreamInternal::need_parsing
enum AVStreamParseType need_parsing
Definition: internal.h:384
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
AVSTREAM_PARSE_FULL_RAW
@ AVSTREAM_PARSE_FULL_RAW
full parsing and repack with timestamp and position generation by parser for raw this assumes that ea...
Definition: avformat.h:772
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:333
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
ipu_read_header
static int ipu_read_header(AVFormatContext *s)
Definition: ipudec.c:50
ff_ipu_demuxer
const AVInputFormat ff_ipu_demuxer
Definition: ipudec.c:71
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:880