mirror of
https://github.com/FFmpeg/FFmpeg.git
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130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/*
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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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