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filmstripenc.c
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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 
32 typedef struct {
33  int nb_frames;
35 
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 
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 
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 
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,
85 };