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/*
* Adobe Filmstrip muxer
* Copyright (c) 2010 Peter Ross
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Adobe Filmstrip muxer
*/
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#define RAND_TAG MKBETAG('R','a','n','d')
typedef struct FilmstripMuxContext {
int nb_frames;
} FilmstripMuxContext;
static int write_header(AVFormatContext *s)
{
if (s->streams[0]->codecpar->format != AV_PIX_FMT_RGBA) {
av_log(s, AV_LOG_ERROR, "only AV_PIX_FMT_RGBA is supported\n");
return AVERROR_INVALIDDATA;
}
return 0;
}
static int write_packet(AVFormatContext *s, AVPacket *pkt)
{
FilmstripMuxContext *film = s->priv_data;
avio_write(s->pb, pkt->data, pkt->size);
film->nb_frames++;
return 0;
}
static int write_trailer(AVFormatContext *s)
{
FilmstripMuxContext *film = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = s->streams[0];
int i;
avio_wb32(pb, RAND_TAG);
avio_wb32(pb, film->nb_frames);
avio_wb16(pb, 0); // packing method
avio_wb16(pb, 0); // reserved
avio_wb16(pb, st->codecpar->width);
avio_wb16(pb, st->codecpar->height);
avio_wb16(pb, 0); // leading
// TODO: should be avg_frame_rate
avio_wb16(pb, 1/av_q2d(st->time_base));
for (i = 0; i < 16; i++)
avio_w8(pb, 0x00); // reserved
return 0;
}
AVOutputFormat ff_filmstrip_muxer = {
.name = "filmstrip",
.long_name = NULL_IF_CONFIG_SMALL("Adobe Filmstrip"),
.extensions = "flm",
.priv_data_size = sizeof(FilmstripMuxContext),
.audio_codec = AV_CODEC_ID_NONE,
.video_codec = AV_CODEC_ID_RAWVIDEO,
.write_header = write_header,
.write_packet = write_packet,
.write_trailer = write_trailer,
};
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