FFmpeg
v210.c
Go to the documentation of this file.
1 /*
2  * Raw v210 video demuxer
3  * Copyright (c) 2015 Tiancheng "Timothy" Gu
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/imgutils.h"
23 #include "libavutil/parseutils.h"
24 #include "libavutil/pixdesc.h"
25 #include "libavutil/opt.h"
26 #include "internal.h"
27 #include "avformat.h"
28 
29 typedef struct V210DemuxerContext {
30  const AVClass *class; /**< Class for private options. */
31  int width, height; /**< Integers describing video size, set by a private option. */
32  AVRational framerate; /**< AVRational describing framerate, set by a private option. */
34 
35 // v210 frame width is padded to multiples of 48
36 #define GET_PACKET_SIZE(w, h) (((w + 47) / 48) * 48 * h * 8 / 3)
37 
39 {
41  AVStream *st;
42  int ret;
43 
45  if (!st)
46  return AVERROR(ENOMEM);
47 
49 
51 
52  avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
53 
54  ret = av_image_check_size(s->width, s->height, 0, ctx);
55  if (ret < 0)
56  return ret;
57  st->codecpar->width = s->width;
58  st->codecpar->height = s->height;
61  ctx->packet_size = GET_PACKET_SIZE(s->width, s->height);
63  (AVRational){8,1}, st->time_base);
64 
65  return 0;
66 }
67 
68 
70 {
71  int ret;
72 
73  ret = av_get_packet(s->pb, pkt, s->packet_size);
74  pkt->pts = pkt->dts = pkt->pos / s->packet_size;
75 
76  pkt->stream_index = 0;
77  if (ret < 0)
78  return ret;
79  return 0;
80 }
81 
82 #define OFFSET(x) offsetof(V210DemuxerContext, x)
83 #define DEC AV_OPT_FLAG_DECODING_PARAM
84 static const AVOption v210_options[] = {
85  { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
86  { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
87  { NULL },
88 };
89 
90 static const AVClass v210_demuxer_class = {
91  .class_name = "v210(x) demuxer",
92  .item_name = av_default_item_name,
93  .option = v210_options,
94  .version = LIBAVUTIL_VERSION_INT,
95 };
96 
97 #if CONFIG_V210_DEMUXER
99  .name = "v210",
100  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
101  .priv_data_size = sizeof(V210DemuxerContext),
105  .extensions = "v210",
106  .raw_codec_id = AV_CODEC_ID_V210,
107  .priv_class = &v210_demuxer_class,
108 };
109 #endif // CONFIG_V210_DEMUXER
110 
111 #if CONFIG_V210X_DEMUXER
113  .name = "v210x",
114  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
115  .priv_data_size = sizeof(V210DemuxerContext),
119  .extensions = "yuv10",
120  .raw_codec_id = AV_CODEC_ID_V210X,
121  .priv_class = &v210_demuxer_class,
122 };
123 #endif // CONFIG_V210X_DEMUXER
GET_PACKET_SIZE
#define GET_PACKET_SIZE(w, h)
Definition: v210.c:36
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
opt.h
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:724
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVInputFormat::raw_codec_id
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:675
AV_OPT_TYPE_VIDEO_RATE
@ AV_OPT_TYPE_VIDEO_RATE
offset must point to AVRational
Definition: opt.h:237
pixdesc.h
OFFSET
#define OFFSET(x)
Definition: v210.c:82
AVOption
AVOption.
Definition: opt.h:247
framerate
int framerate
Definition: h264_levels.c:65
DEC
#define DEC
Definition: v210.c:83
V210DemuxerContext::framerate
AVRational framerate
AVRational describing framerate, set by a private option.
Definition: v210.c:32
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:626
AV_PIX_FMT_YUV422P16
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:401
width
#define width
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
AVFormatContext::iformat
const struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1109
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
ctx
AVFormatContext * ctx
Definition: movenc.c:48
av_rescale_q
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:141
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:992
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:868
NULL
#define NULL
Definition: coverity.c:32
V210DemuxerContext::height
int height
Integers describing video size, set by a private option.
Definition: v210.c:31
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:234
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
parseutils.h
AV_PIX_FMT_YUV422P10
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:390
V210DemuxerContext
Definition: v210.c:29
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
v210_demuxer_class
static const AVClass v210_demuxer_class
Definition: v210.c:90
ff_v210_demuxer
const AVInputFormat ff_v210_demuxer
AV_CODEC_ID_V210
@ AV_CODEC_ID_V210
Definition: codec_id.h:177
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:372
AV_CODEC_ID_V210X
@ AV_CODEC_ID_V210X
Definition: codec_id.h:175
v210_read_header
static int v210_read_header(AVFormatContext *ctx)
Definition: v210.c:38
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
AVCodecParameters::height
int height
Definition: codec_par.h:127
av_get_packet
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:196
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:845
v210_options
static const AVOption v210_options[]
Definition: v210.c:84
AVClass::class_name
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:71
avformat.h
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1146
AVPacket::stream_index
int stream_index
Definition: packet.h:375
AVFormatContext::packet_size
unsigned int packet_size
Definition: avformat.h:1208
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
ff_v210x_demuxer
const AVInputFormat ff_v210x_demuxer
AVCodecParameters::format
int format
Definition: codec_par.h:84
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:393
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
av_image_check_size
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:318
V210DemuxerContext::width
int width
Definition: v210.c:31
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1125
v210_read_packet
static int v210_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: v210.c:69