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libavformat
rawvideodec.c
Go to the documentation of this file.
1
/*
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* RAW video demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "
libavutil/parseutils.h
"
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#include "
libavutil/pixdesc.h
"
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#include "
libavutil/opt.h
"
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#include "
internal.h
"
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#include "
avformat.h
"
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typedef
struct
RawVideoDemuxerContext
{
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const
AVClass
*
class
;
/**< Class for private options. */
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char
*
video_size
;
/**< String describing video size, set by a private option. */
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char
*
pixel_format
;
/**< Set by a private option. */
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char
*
framerate
;
/**< String describing framerate, set by a private option. */
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}
RawVideoDemuxerContext
;
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static
int
rawvideo_read_header
(
AVFormatContext
*ctx)
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{
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RawVideoDemuxerContext
*s = ctx->
priv_data
;
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int
width
= 0,
height
= 0, ret = 0;
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enum
AVPixelFormat
pix_fmt
;
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AVRational
framerate;
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AVStream
*st;
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st =
avformat_new_stream
(ctx,
NULL
);
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if
(!st)
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return
AVERROR
(ENOMEM);
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_VIDEO
;
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st->
codec
->
codec_id
= ctx->
iformat
->
raw_codec_id
;
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if
(s->
video_size
&&
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(ret =
av_parse_video_size
(&width, &
height
, s->
video_size
)) < 0) {
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av_log
(ctx,
AV_LOG_ERROR
,
"Couldn't parse video size.\n"
);
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return
ret;
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}
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if
((pix_fmt =
av_get_pix_fmt
(s->
pixel_format
)) ==
AV_PIX_FMT_NONE
) {
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av_log
(ctx,
AV_LOG_ERROR
,
"No such pixel format: %s.\n"
,
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s->
pixel_format
);
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return
AVERROR
(EINVAL);
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}
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if
((ret =
av_parse_video_rate
(&framerate, s->
framerate
)) < 0) {
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av_log
(ctx,
AV_LOG_ERROR
,
"Could not parse framerate: %s.\n"
,
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s->
framerate
);
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return
ret;
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}
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avpriv_set_pts_info
(st, 64, framerate.
den
, framerate.
num
);
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st->
codec
->
width
=
width
;
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st->
codec
->
height
=
height
;
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st->
codec
->
pix_fmt
=
pix_fmt
;
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st->
codec
->
bit_rate
=
av_rescale_q
(
avpicture_get_size
(st->
codec
->
pix_fmt
, width,
height
),
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(
AVRational
){8,1}, st->time_base);
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return
0;
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}
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static
int
rawvideo_read_packet
(
AVFormatContext
*s,
AVPacket
*
pkt
)
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{
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int
packet_size, ret,
width
,
height
;
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AVStream
*st = s->
streams
[0];
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width = st->
codec
->
width
;
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height = st->
codec
->
height
;
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packet_size =
avpicture_get_size
(st->
codec
->
pix_fmt
, width, height);
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if
(packet_size < 0)
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return
-1;
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ret =
av_get_packet
(s->
pb
, pkt, packet_size);
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pkt->
pts
= pkt->
dts
= pkt->
pos
/ packet_size;
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pkt->
stream_index
= 0;
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if
(ret < 0)
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return
ret;
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return
0;
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}
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#define OFFSET(x) offsetof(RawVideoDemuxerContext, x)
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#define DEC AV_OPT_FLAG_DECODING_PARAM
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static
const
AVOption
rawvideo_options
[] = {
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{
"video_size"
,
"A string describing frame size, such as 640x480 or hd720."
,
OFFSET
(
video_size
),
AV_OPT_TYPE_STRING
, {.str =
NULL
}, 0, 0,
DEC
},
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{
"pixel_format"
,
""
,
OFFSET
(pixel_format),
AV_OPT_TYPE_STRING
, {.str =
"yuv420p"
}, 0, 0,
DEC
},
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{
"framerate"
,
""
,
OFFSET
(framerate),
AV_OPT_TYPE_STRING
, {.str =
"25"
}, 0, 0,
DEC
},
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{
NULL
},
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};
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static
const
AVClass
rawvideo_demuxer_class
= {
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.
class_name
=
"rawvideo demuxer"
,
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.item_name =
av_default_item_name
,
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.option =
rawvideo_options
,
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.version =
LIBAVUTIL_VERSION_INT
,
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};
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AVInputFormat
ff_rawvideo_demuxer
= {
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.
name
=
"rawvideo"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"raw video"
),
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.priv_data_size =
sizeof
(
RawVideoDemuxerContext
),
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.
read_header
=
rawvideo_read_header
,
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.
read_packet
=
rawvideo_read_packet
,
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.
flags
=
AVFMT_GENERIC_INDEX
,
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.extensions =
"yuv,cif,qcif,rgb"
,
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.raw_codec_id =
AV_CODEC_ID_RAWVIDEO
,
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.priv_class = &rawvideo_demuxer_class,
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};
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