FFmpeg
rawvideodec.c
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1 /*
2  * RAW video demuxer
3  * Copyright (c) 2001 Fabrice Bellard
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 RawVideoDemuxerContext {
30  const AVClass *class; /**< Class for private options. */
31  int width, height; /**< Integers describing video size, set by a private option. */
32  char *pixel_format; /**< Set by a private option. */
33  AVRational framerate; /**< AVRational describing framerate, set by a private option. */
35 
36 
38 {
41  AVStream *st;
42  int packet_size;
43 
45  if (!st)
46  return AVERROR(ENOMEM);
47 
49 
51 
52  if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
53  av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n",
54  s->pixel_format);
55  return AVERROR(EINVAL);
56  }
57 
58  avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
59 
60  st->codecpar->width = s->width;
61  st->codecpar->height = s->height;
62  st->codecpar->format = pix_fmt;
63  packet_size = av_image_get_buffer_size(st->codecpar->format, s->width, s->height, 1);
64  if (packet_size < 0)
65  return packet_size;
66  ctx->packet_size = packet_size;
68  (AVRational){8,1}, st->time_base);
69 
70  return 0;
71 }
72 
73 
75 {
76  int ret;
77 
78  ret = av_get_packet(s->pb, pkt, s->packet_size);
79  pkt->pts = pkt->dts = pkt->pos / s->packet_size;
80 
81  pkt->stream_index = 0;
82  if (ret < 0)
83  return ret;
84  return 0;
85 }
86 
87 #define OFFSET(x) offsetof(RawVideoDemuxerContext, x)
88 #define DEC AV_OPT_FLAG_DECODING_PARAM
89 static const AVOption rawvideo_options[] = {
90  { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
91  { "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
92  { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC },
93  { NULL },
94 };
95 
97  .class_name = "rawvideo demuxer",
98  .item_name = av_default_item_name,
99  .option = rawvideo_options,
100  .version = LIBAVUTIL_VERSION_INT,
101 };
102 
104  .name = "rawvideo",
105  .long_name = NULL_IF_CONFIG_SMALL("raw video"),
106  .priv_data_size = sizeof(RawVideoDemuxerContext),
110  .extensions = "yuv,cif,qcif,rgb",
111  .raw_codec_id = AV_CODEC_ID_RAWVIDEO,
112  .priv_class = &rawvideo_demuxer_class,
113 };
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
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:4509
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:693
AV_OPT_TYPE_VIDEO_RATE
@ AV_OPT_TYPE_VIDEO_RATE
offset must point to AVRational
Definition: opt.h:238
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:62
pixdesc.h
AVOption
AVOption.
Definition: opt.h:248
RawVideoDemuxerContext::framerate
AVRational framerate
AVRational describing framerate, set by a private option.
Definition: rawvideodec.c:33
rawvideo_options
static const AVOption rawvideo_options[]
Definition: rawvideodec.c:89
framerate
int framerate
Definition: h264_levels.c:65
RawVideoDemuxerContext
Definition: rawvideodec.c:29
AVFormatContext::iformat
ff_const59 struct AVInputFormat * iformat
The input container format.
Definition: avformat.h:1244
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:463
rawvideo_read_header
static int rawvideo_read_header(AVFormatContext *ctx)
Definition: rawvideodec.c:37
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
AVInputFormat
Definition: avformat.h:640
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:645
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:142
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demuxing_decoding.c:40
ff_rawvideo_demuxer
AVInputFormat ff_rawvideo_demuxer
Definition: rawvideodec.c:103
AVFormatContext
Format I/O context.
Definition: avformat.h:1232
OFFSET
#define OFFSET(x)
Definition: rawvideodec.c:87
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
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:67
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:902
NULL
#define NULL
Definition: coverity.c:32
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:235
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
parseutils.h
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
RawVideoDemuxerContext::pixel_format
char * pixel_format
Set by a private option.
Definition: rawvideodec.c:32
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:4945
RawVideoDemuxerContext::height
int height
Integers describing video size, set by a private option.
Definition: rawvideodec.c:31
rawvideo_read_packet
static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawvideodec.c:74
AVPacket::dts
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.
Definition: packet.h:368
av_image_get_buffer_size
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters.
Definition: imgutils.c:466
DEC
#define DEC
Definition: rawvideodec.c:88
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
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:310
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:873
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:72
avformat.h
av_get_pix_fmt
enum AVPixelFormat av_get_pix_fmt(const char *name)
Return the pixel format corresponding to name.
Definition: pixdesc.c:2501
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AVPacket::stream_index
int stream_index
Definition: packet.h:371
AVFormatContext::packet_size
unsigned int packet_size
Definition: avformat.h:1356
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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:346
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:389
RawVideoDemuxerContext::width
int width
Definition: rawvideodec.c:31
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_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
rawvideo_demuxer_class
static const AVClass rawvideo_demuxer_class
Definition: rawvideodec.c:96
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1260