Imported Debian version 2.5.0~trusty1.1
[deb_ffmpeg.git] / ffmpeg / libavformat / filmstripdec.c
CommitLineData
2ba45a60
DM
1/*
2 * Adobe Filmstrip demuxer
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 demuxer
25 */
26
27#include "libavutil/intreadwrite.h"
28#include "avformat.h"
29#include "internal.h"
30
31#define RAND_TAG MKBETAG('R','a','n','d')
32
33typedef struct {
34 int leading;
35} FilmstripDemuxContext;
36
37static int read_header(AVFormatContext *s)
38{
39 FilmstripDemuxContext *film = s->priv_data;
40 AVIOContext *pb = s->pb;
41 AVStream *st;
42
43 if (!s->pb->seekable)
44 return AVERROR(EIO);
45
46 avio_seek(pb, avio_size(pb) - 36, SEEK_SET);
47 if (avio_rb32(pb) != RAND_TAG) {
48 av_log(s, AV_LOG_ERROR, "magic number not found\n");
49 return AVERROR_INVALIDDATA;
50 }
51
52 st = avformat_new_stream(s, NULL);
53 if (!st)
54 return AVERROR(ENOMEM);
55
56 st->nb_frames = avio_rb32(pb);
57 if (avio_rb16(pb) != 0) {
58 avpriv_request_sample(s, "Unsupported packing method");
59 return AVERROR_PATCHWELCOME;
60 }
61
62 avio_skip(pb, 2);
63 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
64 st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
65 st->codec->pix_fmt = AV_PIX_FMT_RGBA;
66 st->codec->codec_tag = 0; /* no fourcc */
67 st->codec->width = avio_rb16(pb);
68 st->codec->height = avio_rb16(pb);
69 film->leading = avio_rb16(pb);
f6fa7814
DM
70
71 if (st->codec->width * 4LL * st->codec->height >= INT_MAX) {
72 av_log(s, AV_LOG_ERROR, "dimensions too large\n");
73 return AVERROR_PATCHWELCOME;
74 }
75
2ba45a60
DM
76 avpriv_set_pts_info(st, 64, 1, avio_rb16(pb));
77
78 avio_seek(pb, 0, SEEK_SET);
79
80 return 0;
81}
82
83static int read_packet(AVFormatContext *s,
84 AVPacket *pkt)
85{
86 FilmstripDemuxContext *film = s->priv_data;
87 AVStream *st = s->streams[0];
88
89 if (avio_feof(s->pb))
90 return AVERROR(EIO);
f6fa7814 91 pkt->dts = avio_tell(s->pb) / (st->codec->width * (int64_t)(st->codec->height + film->leading) * 4);
2ba45a60 92 pkt->size = av_get_packet(s->pb, pkt, st->codec->width * st->codec->height * 4);
f6fa7814 93 avio_skip(s->pb, st->codec->width * (int64_t) film->leading * 4);
2ba45a60
DM
94 if (pkt->size < 0)
95 return pkt->size;
96 pkt->flags |= AV_PKT_FLAG_KEY;
97 return 0;
98}
99
100static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
101{
102 AVStream *st = s->streams[stream_index];
103 if (avio_seek(s->pb, FFMAX(timestamp, 0) * st->codec->width * st->codec->height * 4, SEEK_SET) < 0)
104 return -1;
105 return 0;
106}
107
108AVInputFormat ff_filmstrip_demuxer = {
109 .name = "filmstrip",
110 .long_name = NULL_IF_CONFIG_SMALL("Adobe Filmstrip"),
111 .priv_data_size = sizeof(FilmstripDemuxContext),
112 .read_header = read_header,
113 .read_packet = read_packet,
114 .read_seek = read_seek,
115 .extensions = "flm",
116};