1/* 2 * RAW video demuxer 3 * Copyright (c) 2001 Fabrice Bellard 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/parseutils.h" 23#include "libavutil/pixdesc.h" 24#include "libavutil/opt.h" 25#include "internal.h" 26#include "avformat.h" 27 28typedef struct RawVideoDemuxerContext { 29 const AVClass *class; /**< Class for private options. */ 30 int width, height; /**< Integers describing video size, set by a private option. */ 31 char *pixel_format; /**< Set by a private option. */ 32 AVRational framerate; /**< AVRational describing framerate, set by a private option. */ 33} RawVideoDemuxerContext; 34 35 36static int rawvideo_read_header(AVFormatContext *ctx) 37{ 38 RawVideoDemuxerContext *s = ctx->priv_data; 39 enum AVPixelFormat pix_fmt; 40 AVStream *st; 41 42 st = avformat_new_stream(ctx, NULL); 43 if (!st) 44 return AVERROR(ENOMEM); 45 46 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 47 48 st->codec->codec_id = ctx->iformat->raw_codec_id; 49 50 if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) { 51 av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n", 52 s->pixel_format); 53 return AVERROR(EINVAL); 54 } 55 56 avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num); 57 58 st->codec->width = s->width; 59 st->codec->height = s->height; 60 st->codec->pix_fmt = pix_fmt; 61 st->codec->bit_rate = av_rescale_q(avpicture_get_size(st->codec->pix_fmt, s->width, s->height), 62 (AVRational){8,1}, st->time_base); 63 64 return 0; 65} 66 67 68static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt) 69{ 70 int packet_size, ret, width, height; 71 AVStream *st = s->streams[0]; 72 73 width = st->codec->width; 74 height = st->codec->height; 75 76 packet_size = avpicture_get_size(st->codec->pix_fmt, width, height); 77 if (packet_size < 0) 78 return -1; 79 80 ret = av_get_packet(s->pb, pkt, packet_size); 81 pkt->pts = pkt->dts = pkt->pos / packet_size; 82 83 pkt->stream_index = 0; 84 if (ret < 0) 85 return ret; 86 return 0; 87} 88 89#define OFFSET(x) offsetof(RawVideoDemuxerContext, x) 90#define DEC AV_OPT_FLAG_DECODING_PARAM 91static const AVOption rawvideo_options[] = { 92 { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, 93 { "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC }, 94 { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC }, 95 { NULL }, 96}; 97 98static const AVClass rawvideo_demuxer_class = { 99 .class_name = "rawvideo demuxer", 100 .item_name = av_default_item_name, 101 .option = rawvideo_options, 102 .version = LIBAVUTIL_VERSION_INT, 103}; 104 105AVInputFormat ff_rawvideo_demuxer = { 106 .name = "rawvideo", 107 .long_name = NULL_IF_CONFIG_SMALL("raw video"), 108 .priv_data_size = sizeof(RawVideoDemuxerContext), 109 .read_header = rawvideo_read_header, 110 .read_packet = rawvideo_read_packet, 111 .flags = AVFMT_GENERIC_INDEX, 112 .extensions = "yuv,cif,qcif,rgb", 113 .raw_codec_id = AV_CODEC_ID_RAWVIDEO, 114 .priv_class = &rawvideo_demuxer_class, 115}; 116