mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 01:42:20 +00:00
116 lines
3.8 KiB
C
116 lines
3.8 KiB
C
/*
|
|
* RAW video demuxer
|
|
* Copyright (c) 2001 Fabrice Bellard
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/parseutils.h"
|
|
#include "libavutil/pixdesc.h"
|
|
#include "libavutil/opt.h"
|
|
#include "internal.h"
|
|
#include "avformat.h"
|
|
|
|
typedef struct RawVideoDemuxerContext {
|
|
const AVClass *class; /**< Class for private options. */
|
|
int width, height; /**< Integers describing video size, set by a private option. */
|
|
char *pixel_format; /**< Set by a private option. */
|
|
AVRational framerate; /**< AVRational describing framerate, set by a private option. */
|
|
} RawVideoDemuxerContext;
|
|
|
|
|
|
static int rawvideo_read_header(AVFormatContext *ctx)
|
|
{
|
|
RawVideoDemuxerContext *s = ctx->priv_data;
|
|
enum AVPixelFormat pix_fmt;
|
|
AVStream *st;
|
|
|
|
st = avformat_new_stream(ctx, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
|
|
st->codec->codec_id = ctx->iformat->raw_codec_id;
|
|
|
|
if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {
|
|
av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n",
|
|
s->pixel_format);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);
|
|
|
|
st->codec->width = s->width;
|
|
st->codec->height = s->height;
|
|
st->codec->pix_fmt = pix_fmt;
|
|
st->codec->bit_rate = av_rescale_q(avpicture_get_size(st->codec->pix_fmt, s->width, s->height),
|
|
(AVRational){8,1}, st->time_base);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
int packet_size, ret, width, height;
|
|
AVStream *st = s->streams[0];
|
|
|
|
width = st->codec->width;
|
|
height = st->codec->height;
|
|
|
|
packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
|
|
if (packet_size < 0)
|
|
return -1;
|
|
|
|
ret = av_get_packet(s->pb, pkt, packet_size);
|
|
pkt->pts = pkt->dts = pkt->pos / packet_size;
|
|
|
|
pkt->stream_index = 0;
|
|
if (ret < 0)
|
|
return ret;
|
|
return 0;
|
|
}
|
|
|
|
#define OFFSET(x) offsetof(RawVideoDemuxerContext, x)
|
|
#define DEC AV_OPT_FLAG_DECODING_PARAM
|
|
static const AVOption rawvideo_options[] = {
|
|
{ "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
|
|
{ "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },
|
|
{ "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
|
|
{ NULL },
|
|
};
|
|
|
|
static const AVClass rawvideo_demuxer_class = {
|
|
.class_name = "rawvideo demuxer",
|
|
.item_name = av_default_item_name,
|
|
.option = rawvideo_options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
AVInputFormat ff_rawvideo_demuxer = {
|
|
.name = "rawvideo",
|
|
.long_name = NULL_IF_CONFIG_SMALL("raw video"),
|
|
.priv_data_size = sizeof(RawVideoDemuxerContext),
|
|
.read_header = rawvideo_read_header,
|
|
.read_packet = rawvideo_read_packet,
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
.extensions = "yuv,cif,qcif,rgb",
|
|
.raw_codec_id = AV_CODEC_ID_RAWVIDEO,
|
|
.priv_class = &rawvideo_demuxer_class,
|
|
};
|