blob: a801f4bd22e41cabe4bb08b4b13c04d0bf9a76b9
1 | /* |
2 | * VC1 Test Bitstreams Format Demuxer |
3 | * Copyright (c) 2006, 2008 Konstantin Shishkov |
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 | * VC1 test bitstream file demuxer |
25 | * by Konstantin Shishkov |
26 | * Format specified in SMPTE standard 421 Annex L |
27 | */ |
28 | |
29 | #include "libavutil/intreadwrite.h" |
30 | #include "avformat.h" |
31 | #include "internal.h" |
32 | |
33 | #define VC1_EXTRADATA_SIZE 4 |
34 | |
35 | static int vc1t_probe(AVProbeData *p) |
36 | { |
37 | if (p->buf_size < 24) |
38 | return 0; |
39 | if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC) |
40 | return 0; |
41 | |
42 | return AVPROBE_SCORE_EXTENSION; |
43 | } |
44 | |
45 | static int vc1t_read_header(AVFormatContext *s) |
46 | { |
47 | AVIOContext *pb = s->pb; |
48 | AVStream *st; |
49 | int frames; |
50 | uint32_t fps; |
51 | |
52 | frames = avio_rl24(pb); |
53 | if(avio_r8(pb) != 0xC5 || avio_rl32(pb) != 4) |
54 | return AVERROR_INVALIDDATA; |
55 | |
56 | /* init video codec */ |
57 | st = avformat_new_stream(s, NULL); |
58 | if (!st) |
59 | return AVERROR(ENOMEM); |
60 | |
61 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
62 | st->codecpar->codec_id = AV_CODEC_ID_WMV3; |
63 | |
64 | if (ff_get_extradata(s, st->codecpar, pb, VC1_EXTRADATA_SIZE) < 0) |
65 | return AVERROR(ENOMEM); |
66 | st->codecpar->height = avio_rl32(pb); |
67 | st->codecpar->width = avio_rl32(pb); |
68 | if(avio_rl32(pb) != 0xC) |
69 | return AVERROR_INVALIDDATA; |
70 | avio_skip(pb, 8); |
71 | fps = avio_rl32(pb); |
72 | if(fps == 0xFFFFFFFF) |
73 | avpriv_set_pts_info(st, 32, 1, 1000); |
74 | else{ |
75 | if (!fps) { |
76 | av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n"); |
77 | fps = 1; |
78 | } |
79 | avpriv_set_pts_info(st, 24, 1, fps); |
80 | st->duration = frames; |
81 | } |
82 | |
83 | return 0; |
84 | } |
85 | |
86 | static int vc1t_read_packet(AVFormatContext *s, |
87 | AVPacket *pkt) |
88 | { |
89 | AVIOContext *pb = s->pb; |
90 | int frame_size; |
91 | int keyframe = 0; |
92 | uint32_t pts; |
93 | |
94 | if(avio_feof(pb)) |
95 | return AVERROR(EIO); |
96 | |
97 | frame_size = avio_rl24(pb); |
98 | if(avio_r8(pb) & 0x80) |
99 | keyframe = 1; |
100 | pts = avio_rl32(pb); |
101 | if(av_get_packet(pb, pkt, frame_size) < 0) |
102 | return AVERROR(EIO); |
103 | if(s->streams[0]->time_base.den == 1000) |
104 | pkt->pts = pts; |
105 | pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0; |
106 | pkt->pos -= 8; |
107 | |
108 | return pkt->size; |
109 | } |
110 | |
111 | AVInputFormat ff_vc1t_demuxer = { |
112 | .name = "vc1test", |
113 | .long_name = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"), |
114 | .read_probe = vc1t_probe, |
115 | .read_header = vc1t_read_header, |
116 | .read_packet = vc1t_read_packet, |
117 | .flags = AVFMT_GENERIC_INDEX, |
118 | }; |
119 |