| /* |
| * 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. */ |
| char *video_size; /**< String describing video size, set by a private option. */ |
| char *pixel_format; /**< Set by a private option. */ |
| char *framerate; /**< String describing framerate, set by a private option. */ |
| } RawVideoDemuxerContext; |
| |
| |
| static int rawvideo_read_header(AVFormatContext *ctx) |
| { |
| RawVideoDemuxerContext *s = ctx->priv_data; |
| int width = 0, height = 0, ret = 0; |
| enum AVPixelFormat pix_fmt; |
| AVRational framerate; |
| 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 (s->video_size && |
| (ret = av_parse_video_size(&width, &height, s->video_size)) < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Couldn't parse video size.\n"); |
| return ret; |
| } |
| |
| 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); |
| } |
| |
| if ((ret = av_parse_video_rate(&framerate, s->framerate)) < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Could not parse framerate: %s.\n", |
| s->framerate); |
| return ret; |
| } |
| |
| avpriv_set_pts_info(st, 64, framerate.den, framerate.num); |
| |
| st->codec->width = width; |
| st->codec->height = height; |
| st->codec->pix_fmt = pix_fmt; |
| st->codec->bit_rate = av_rescale_q(avpicture_get_size(st->codec->pix_fmt, width, 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", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, |
| { "pixel_format", "", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC }, |
| { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.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, |
| }; |