1/* 2 * Adobe Filmstrip muxer 3 * Copyright (c) 2010 Peter Ross 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/** 23 * @file 24 * Adobe Filmstrip muxer 25 */ 26 27#include "libavutil/intreadwrite.h" 28#include "avformat.h" 29 30#define RAND_TAG MKBETAG('R','a','n','d') 31 32typedef struct { 33 int nb_frames; 34} FilmstripMuxContext; 35 36static int write_header(AVFormatContext *s) 37{ 38 if (s->streams[0]->codec->pix_fmt != AV_PIX_FMT_RGBA) { 39 av_log(s, AV_LOG_ERROR, "only AV_PIX_FMT_RGBA is supported\n"); 40 return AVERROR_INVALIDDATA; 41 } 42 return 0; 43} 44 45static int write_packet(AVFormatContext *s, AVPacket *pkt) 46{ 47 FilmstripMuxContext *film = s->priv_data; 48 avio_write(s->pb, pkt->data, pkt->size); 49 film->nb_frames++; 50 return 0; 51} 52 53static int write_trailer(AVFormatContext *s) 54{ 55 FilmstripMuxContext *film = s->priv_data; 56 AVIOContext *pb = s->pb; 57 AVStream *st = s->streams[0]; 58 int i; 59 60 avio_wb32(pb, RAND_TAG); 61 avio_wb32(pb, film->nb_frames); 62 avio_wb16(pb, 0); // packing method 63 avio_wb16(pb, 0); // reserved 64 avio_wb16(pb, st->codec->width); 65 avio_wb16(pb, st->codec->height); 66 avio_wb16(pb, 0); // leading 67 // TODO: should be avg_frame_rate 68 avio_wb16(pb, st->time_base.den / st->time_base.num); 69 for (i = 0; i < 16; i++) 70 avio_w8(pb, 0x00); // reserved 71 72 return 0; 73} 74 75AVOutputFormat ff_filmstrip_muxer = { 76 .name = "filmstrip", 77 .long_name = NULL_IF_CONFIG_SMALL("Adobe Filmstrip"), 78 .extensions = "flm", 79 .priv_data_size = sizeof(FilmstripMuxContext), 80 .audio_codec = AV_CODEC_ID_NONE, 81 .video_codec = AV_CODEC_ID_RAWVIDEO, 82 .write_header = write_header, 83 .write_packet = write_packet, 84 .write_trailer = write_trailer, 85}; 86