LCOV - code coverage report
Current view: top level - libavformat - vc1test.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 4 48 8.3 %
Date: 2017-12-11 04:34:20 Functions: 1 3 33.3 %

          Line data    Source code
       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        6130 : static int vc1t_probe(AVProbeData *p)
      36             : {
      37        6130 :     if (p->buf_size < 24)
      38           0 :         return 0;
      39        6130 :     if (p->buf[3] != 0xC5 || AV_RL32(&p->buf[4]) != 4 || AV_RL32(&p->buf[20]) != 0xC)
      40        6130 :         return 0;
      41             : 
      42           0 :     return AVPROBE_SCORE_EXTENSION;
      43             : }
      44             : 
      45           0 : static int vc1t_read_header(AVFormatContext *s)
      46             : {
      47           0 :     AVIOContext *pb = s->pb;
      48             :     AVStream *st;
      49             :     int frames;
      50             :     uint32_t fps;
      51             : 
      52           0 :     frames = avio_rl24(pb);
      53           0 :     if(avio_r8(pb) != 0xC5 || avio_rl32(pb) != 4)
      54           0 :         return AVERROR_INVALIDDATA;
      55             : 
      56             :     /* init video codec */
      57           0 :     st = avformat_new_stream(s, NULL);
      58           0 :     if (!st)
      59           0 :         return AVERROR(ENOMEM);
      60             : 
      61           0 :     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
      62           0 :     st->codecpar->codec_id = AV_CODEC_ID_WMV3;
      63             : 
      64           0 :     if (ff_get_extradata(s, st->codecpar, pb, VC1_EXTRADATA_SIZE) < 0)
      65           0 :         return AVERROR(ENOMEM);
      66           0 :     st->codecpar->height = avio_rl32(pb);
      67           0 :     st->codecpar->width = avio_rl32(pb);
      68           0 :     if(avio_rl32(pb) != 0xC)
      69           0 :         return AVERROR_INVALIDDATA;
      70           0 :     avio_skip(pb, 8);
      71           0 :     fps = avio_rl32(pb);
      72           0 :     if(fps == 0xFFFFFFFF)
      73           0 :         avpriv_set_pts_info(st, 32, 1, 1000);
      74             :     else{
      75           0 :         if (!fps) {
      76           0 :             av_log(s, AV_LOG_ERROR, "Zero FPS specified, defaulting to 1 FPS\n");
      77           0 :             fps = 1;
      78             :         }
      79           0 :         avpriv_set_pts_info(st, 24, 1, fps);
      80           0 :         st->duration = frames;
      81             :     }
      82             : 
      83           0 :     return 0;
      84             : }
      85             : 
      86           0 : static int vc1t_read_packet(AVFormatContext *s,
      87             :                            AVPacket *pkt)
      88             : {
      89           0 :     AVIOContext *pb = s->pb;
      90             :     int frame_size;
      91           0 :     int keyframe = 0;
      92             :     uint32_t pts;
      93             : 
      94           0 :     if(avio_feof(pb))
      95           0 :         return AVERROR(EIO);
      96             : 
      97           0 :     frame_size = avio_rl24(pb);
      98           0 :     if(avio_r8(pb) & 0x80)
      99           0 :         keyframe = 1;
     100           0 :     pts = avio_rl32(pb);
     101           0 :     if(av_get_packet(pb, pkt, frame_size) < 0)
     102           0 :         return AVERROR(EIO);
     103           0 :     if(s->streams[0]->time_base.den == 1000)
     104           0 :         pkt->pts = pts;
     105           0 :     pkt->flags |= keyframe ? AV_PKT_FLAG_KEY : 0;
     106           0 :     pkt->pos -= 8;
     107             : 
     108           0 :     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             : };

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