blob: 8ead696360ebcf3633bf0aa741901743e69e3ec3
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 FilmstripMuxContext { |
33 | int nb_frames; |
34 | } FilmstripMuxContext; |
35 | |
36 | static int write_header(AVFormatContext *s) |
37 | { |
38 | if (s->streams[0]->codecpar->format != 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 | |
45 | static 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 | |
53 | static 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->codecpar->width); |
65 | avio_wb16(pb, st->codecpar->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 | |
75 | AVOutputFormat 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 |