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ffmpeg / libavformat / filmstripenc.c @ 2912e87a

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/*
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 * Adobe Filmstrip muxer
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 * Copyright (c) 2010 Peter Ross
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Adobe Filmstrip muxer
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 */
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#define RAND_TAG MKBETAG('R','a','n','d')
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typedef struct {
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    int nb_frames;
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} FilmstripMuxContext;
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static int write_header(AVFormatContext *s)
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{
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    if (s->streams[0]->codec->pix_fmt != PIX_FMT_RGBA) {
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        av_log(s, AV_LOG_ERROR, "only PIX_FMT_RGBA is supported\n");
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        return AVERROR_INVALIDDATA;
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    }
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    return 0;
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}
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static int write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    FilmstripMuxContext *film = s->priv_data;
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    avio_write(s->pb, pkt->data, pkt->size);
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    film->nb_frames++;
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    return 0;
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}
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static int write_trailer(AVFormatContext *s)
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{
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    FilmstripMuxContext *film = s->priv_data;
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    AVIOContext *pb = s->pb;
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    AVStream *st = s->streams[0];
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    int i;
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    avio_wb32(pb, RAND_TAG);
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    avio_wb32(pb, film->nb_frames);
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    avio_wb16(pb, 0);  // packing method
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    avio_wb16(pb, 0);  // reserved
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    avio_wb16(pb, st->codec->width);
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    avio_wb16(pb, st->codec->height);
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    avio_wb16(pb, 0);  // leading
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    avio_wb16(pb, 1/av_q2d(st->codec->time_base));
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    for (i = 0; i < 16; i++)
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        avio_w8(pb, 0x00);  // reserved
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    avio_flush(pb);
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    return 0;
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}
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AVOutputFormat ff_filmstrip_muxer = {
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    "filmstrip",
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    NULL_IF_CONFIG_SMALL("Adobe Filmstrip"),
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    NULL,
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    "flm",
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    sizeof(FilmstripMuxContext),
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    CODEC_ID_NONE,
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    CODEC_ID_RAWVIDEO,
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    write_header,
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    write_packet,
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    write_trailer,
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};