| /* |
| * 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, |
| }; |