aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* 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/imgutils.h"
#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;
int packet_size;
st = avformat_new_stream(ctx, NULL);
if (!st)
return AVERROR(ENOMEM);
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->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->codecpar->width = s->width;
st->codecpar->height = s->height;
st->codecpar->format = pix_fmt;
packet_size = av_image_get_buffer_size(st->codecpar->format, s->width, s->height, 1);
if (packet_size < 0)
return packet_size;
ctx->packet_size = packet_size;
st->codecpar->bit_rate = av_rescale_q(ctx->packet_size,
(AVRational){8,1}, st->time_base);
return 0;
}
static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret;
ret = av_get_packet(s->pb, pkt, s->packet_size);
pkt->pts = pkt->dts = pkt->pos / s->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, INT_MAX, 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,
};
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