FFmpeg
v210.c
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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 
44  st = avformat_new_stream(ctx, NULL);
45  if (!st)
46  return AVERROR(ENOMEM);
47 
49 
51 
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 #if CONFIG_V210_DEMUXER
91 static const AVClass v210_demuxer_class = {
92  .class_name = "v210 demuxer",
93  .item_name = av_default_item_name,
94  .option = v210_options,
95  .version = LIBAVUTIL_VERSION_INT,
96 };
97 
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
112 static const AVClass v210x_demuxer_class = {
113  .class_name = "v210x demuxer",
114  .item_name = av_default_item_name,
115  .option = v210_options,
116  .version = LIBAVUTIL_VERSION_INT,
117 };
118 
120  .name = "v210x",
121  .long_name = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
122  .priv_data_size = sizeof(V210DemuxerContext),
126  .extensions = "yuv10",
127  .raw_codec_id = AV_CODEC_ID_V210X,
128  .priv_class = &v210x_demuxer_class,
129 };
130 #endif // CONFIG_V210X_DEMUXER
unsigned int packet_size
Definition: avformat.h:1482
#define NULL
Definition: coverity.c:32
AVOption.
Definition: opt.h:246
misc image utilities
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1497
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:3953
int num
Numerator.
Definition: rational.h:59
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1358
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: avcodec.h:4019
AVOptions.
static int v210_read_header(AVFormatContext *ctx)
Definition: v210.c:38
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4455
AVRational framerate
AVRational describing framerate, set by a private option.
Definition: v210.c:32
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
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: avcodec.h:3982
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq)
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:142
int height
Integers describing video size, set by a private option.
Definition: v210.c:31
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
ff_const59 struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1370
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3949
static const AVOption v210_options[]
Definition: v210.c:84
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:282
#define DEC
Definition: v210.c:83
AVInputFormat ff_v210_demuxer
AVFormatContext * ctx
Definition: movenc.c:48
#define s(width, name)
Definition: cbs_vp9.c:257
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int v210_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: v210.c:69
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
Describe the class of an AVClass context structure.
Definition: log.h:67
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
Rational number (pair of numerator and denominator).
Definition: rational.h:58
offset must point to AVRational
Definition: opt.h:236
offset must point to two consecutive integers
Definition: opt.h:233
misc parsing utilities
int raw_codec_id
Raw demuxers store their codec ID here.
Definition: avformat.h:700
#define flags(name, subs,...)
Definition: cbs_av1.c:561
#define AV_PIX_FMT_YUV422P10
Definition: pixfmt.h:388
Main libavformat public API header.
#define OFFSET(x)
Definition: v210.c:82
AVInputFormat ff_v210x_demuxer
int den
Denominator.
Definition: rational.h:60
#define GET_PACKET_SIZE(w, h)
Definition: v210.c:36
void * priv_data
Format private data.
Definition: avformat.h:1386
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1476
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int stream_index
Definition: avcodec.h:1479
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avformat.h:910
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
This structure stores compressed data.
Definition: avcodec.h:1454
#define AV_PIX_FMT_YUV422P16
Definition: pixfmt.h:399
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1470