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:4347
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
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:63
pixdesc.h
AVOption
AVOption.
Definition: opt.h:247
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
ff_rawvideo_demuxer
const AVInputFormat ff_rawvideo_demuxer
Definition: rawvideodec.c:103
AVFMT_GENERIC_INDEX
#define AVFMT_GENERIC_INDEX
Use generic index building code.
Definition: avformat.h:468
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:180
AVInputFormat
Definition: avformat.h:626
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:1119
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
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demuxing_decoding.c:41
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
OFFSET
#define OFFSET(x)
Definition: rawvideodec.c:87
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:994
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:870
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:234
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:4771
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:372
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: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:257
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:847
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
av_get_pix_fmt
enum AVPixelFormat av_get_pix_fmt(const char *name)
Return the pixel format corresponding to name.
Definition: pixdesc.c:2472
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AVPacket::stream_index
int stream_index
Definition: packet.h:375
AVFormatContext::packet_size
unsigned int packet_size
Definition: avformat.h:1218
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:350
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:393
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:228
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1135