Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2010 Reimar Döffinger 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * Libav is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with Libav; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 #include "avformat.h" 00021 #include "libavutil/intreadwrite.h" 00022 00023 static int ivf_write_header(AVFormatContext *s) 00024 { 00025 AVCodecContext *ctx; 00026 AVIOContext *pb = s->pb; 00027 00028 if (s->nb_streams != 1) { 00029 av_log(s, AV_LOG_ERROR, "Format supports only exactly one video stream\n"); 00030 return AVERROR(EINVAL); 00031 } 00032 ctx = s->streams[0]->codec; 00033 if (ctx->codec_type != AVMEDIA_TYPE_VIDEO || ctx->codec_id != CODEC_ID_VP8) { 00034 av_log(s, AV_LOG_ERROR, "Currently only VP8 is supported!\n"); 00035 return AVERROR(EINVAL); 00036 } 00037 avio_write(pb, "DKIF", 4); 00038 avio_wl16(pb, 0); // version 00039 avio_wl16(pb, 32); // header length 00040 avio_wl32(pb, ctx->codec_tag ? ctx->codec_tag : AV_RL32("VP80")); 00041 avio_wl16(pb, ctx->width); 00042 avio_wl16(pb, ctx->height); 00043 avio_wl32(pb, s->streams[0]->time_base.den); 00044 avio_wl32(pb, s->streams[0]->time_base.num); 00045 avio_wl64(pb, s->streams[0]->duration); // TODO: duration or number of frames?!? 00046 00047 return 0; 00048 } 00049 00050 static int ivf_write_packet(AVFormatContext *s, AVPacket *pkt) 00051 { 00052 AVIOContext *pb = s->pb; 00053 avio_wl32(pb, pkt->size); 00054 avio_wl64(pb, pkt->pts); 00055 avio_write(pb, pkt->data, pkt->size); 00056 avio_flush(pb); 00057 00058 return 0; 00059 } 00060 00061 AVOutputFormat ff_ivf_muxer = { 00062 .name = "ivf", 00063 .long_name = NULL_IF_CONFIG_SMALL("On2 IVF"), 00064 .extensions = "ivf", 00065 .audio_codec = CODEC_ID_NONE, 00066 .video_codec = CODEC_ID_VP8, 00067 .write_header = ivf_write_header, 00068 .write_packet = ivf_write_packet, 00069 };