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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 | ||
33 | typedef struct { | |
34 | int leading; | |
35 | } FilmstripDemuxContext; | |
36 | ||
37 | static 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 | ||
83 | static 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 | ||
100 | static 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 | ||
108 | AVInputFormat 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 | }; |