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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * VC1 Test Bitstreams Format Demuxer |
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| 3 | * Copyright (c) 2006, 2008 Konstantin Shishkov |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * VC1 test bitstream file demuxer |
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| 25 | * by Konstantin Shishkov |
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| 26 | * Format specified in SMPTE standard 421 Annex L |
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| 27 | */ |
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| 28 | |||
| 29 | #include "libavutil/intreadwrite.h" |
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| 30 | #include "avformat.h" |
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| 31 | #include "internal.h" |
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| 32 | |||
| 33 | #define VC1_EXTRADATA_SIZE 4 |
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| 34 | |||
| 35 | static int vc1t_probe(AVProbeData *p) |
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| 36 | { |
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| 37 | if (p->buf_size < 24) |
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| 38 | return 0; |
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| 39 | if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC) |
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| 40 | return 0; |
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| 41 | |||
| 42 | return AVPROBE_SCORE_EXTENSION; |
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| 43 | } |
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| 44 | |||
| 45 | static int vc1t_read_header(AVFormatContext *s) |
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| 46 | { |
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| 47 | AVIOContext *pb = s->pb; |
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| 48 | AVStream *st; |
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| 49 | int frames; |
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| 50 | uint32_t fps; |
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| 51 | |||
| 52 | frames = avio_rl24(pb); |
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| 53 | if(avio_r8(pb) != 0xC5 || avio_rl32(pb) != 4) |
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| 54 | return -1; |
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| 55 | |||
| 56 | /* init video codec */ |
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| 57 | st = avformat_new_stream(s, NULL); |
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| 58 | if (!st) |
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| 59 | return -1; |
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| 60 | |||
| 61 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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| 62 | st->codec->codec_id = AV_CODEC_ID_WMV3; |
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| 63 | |||
| 64 | if (ff_alloc_extradata(st->codec, VC1_EXTRADATA_SIZE)) |
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| 65 | return AVERROR(ENOMEM); |
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| 66 | avio_read(pb, st->codec->extradata, VC1_EXTRADATA_SIZE); |
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| 67 | st->codec->height = avio_rl32(pb); |
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| 68 | st->codec->width = avio_rl32(pb); |
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| 69 | if(avio_rl32(pb) != 0xC) |
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| 70 | return -1; |
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| 71 | avio_skip(pb, 8); |
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| 72 | fps = avio_rl32(pb); |
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| 73 | if(fps == 0xFFFFFFFF) |
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| 74 | avpriv_set_pts_info(st, 32, 1, 1000); |
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| 75 | else{ |
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| 76 | if (!fps) { |
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| 77 | av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n"); |
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| 78 | fps = 1; |
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| 79 | } |
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| 80 | avpriv_set_pts_info(st, 24, 1, fps); |
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| 81 | st->duration = frames; |
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| 82 | } |
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| 83 | |||
| 84 | return 0; |
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| 85 | } |
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| 86 | |||
| 87 | static int vc1t_read_packet(AVFormatContext *s, |
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| 88 | AVPacket *pkt) |
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| 89 | { |
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| 90 | AVIOContext *pb = s->pb; |
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| 91 | int frame_size; |
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| 92 | int keyframe = 0; |
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| 93 | uint32_t pts; |
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| 94 | |||
| 95 | if(url_feof(pb)) |
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| 96 | return AVERROR(EIO); |
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| 97 | |||
| 98 | frame_size = avio_rl24(pb); |
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| 99 | if(avio_r8(pb) & 0x80) |
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| 100 | keyframe = 1; |
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| 101 | pts = avio_rl32(pb); |
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| 102 | if(av_get_packet(pb, pkt, frame_size) < 0) |
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| 103 | return AVERROR(EIO); |
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| 104 | if(s->streams[0]->time_base.den == 1000) |
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| 105 | pkt->pts = pts; |
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| 106 | pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0; |
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| 107 | pkt->pos -= 8; |
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| 108 | |||
| 109 | return pkt->size; |
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| 110 | } |
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| 111 | |||
| 112 | AVInputFormat ff_vc1t_demuxer = { |
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| 113 | .name = "vc1test", |
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| 114 | .long_name = NULL_IF_CONFIG_SMALL("VC-1 test bitstream"), |
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| 115 | .read_probe = vc1t_probe, |
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| 116 | .read_header = vc1t_read_header, |
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| 117 | .read_packet = vc1t_read_packet, |
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| 118 | .flags = AVFMT_GENERIC_INDEX, |
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| 119 | }; |