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