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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->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
62 | st->codec->codec_id = AV_CODEC_ID_WMV3; | |
63 | ||
64 | if (ff_get_extradata(st->codec, pb, VC1_EXTRADATA_SIZE) < 0) | |
65 | return AVERROR(ENOMEM); | |
66 | st->codec->height = avio_rl32(pb); | |
67 | st->codec->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 | }; |