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2ba45a60 DM |
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; | |
34 | } FilmstripMuxContext; | |
35 | ||
36 | static 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 | ||
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->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 | ||
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 | }; |