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113 lines
3.8 KiB
113 lines
3.8 KiB
/* |
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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/imgutils.h" |
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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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int width, height; /**< Integers describing video size, set by a private option. */ |
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char *pixel_format; /**< Set by a private option. */ |
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AVRational framerate; /**< AVRational 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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enum AVPixelFormat pix_fmt; |
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AVStream *st; |
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int packet_size; |
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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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
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st->codecpar->codec_id = ctx->iformat->raw_codec_id; |
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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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avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num); |
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st->codecpar->width = s->width; |
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st->codecpar->height = s->height; |
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st->codecpar->format = pix_fmt; |
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packet_size = av_image_get_buffer_size(st->codecpar->format, s->width, s->height, 1); |
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if (packet_size < 0) |
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return packet_size; |
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ctx->packet_size = packet_size; |
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st->codecpar->bit_rate = av_rescale_q(ctx->packet_size, |
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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 ret; |
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ret = av_get_packet(s->pb, pkt, s->packet_size); |
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pkt->pts = pkt->dts = pkt->pos / s->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", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, |
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{ "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC }, |
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{ "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, 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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const 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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