LCOV - code coverage report
Current view: top level - src/libavformat - cdg.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 24 26 92.3 %
Date: 2017-05-26 21:11:57 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * CD Graphics Demuxer
       3             :  * Copyright (c) 2009 Michael Tison
       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             : #include "avformat.h"
      23             : #include "internal.h"
      24             : 
      25             : #define CDG_PACKET_SIZE    24
      26             : #define CDG_COMMAND        0x09
      27             : #define CDG_MASK           0x3F
      28             : 
      29             : typedef struct CDGContext {
      30             :     int got_first_packet;
      31             : } CDGContext;
      32             : 
      33           1 : static int read_header(AVFormatContext *s)
      34             : {
      35             :     AVStream *vst;
      36             :     int ret;
      37             : 
      38           1 :     vst = avformat_new_stream(s, NULL);
      39           1 :     if (!vst)
      40           0 :         return AVERROR(ENOMEM);
      41             : 
      42           1 :     vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
      43           1 :     vst->codecpar->codec_id   = AV_CODEC_ID_CDGRAPHICS;
      44             : 
      45             :     /// 75 sectors/sec * 4 packets/sector = 300 packets/sec
      46           1 :     avpriv_set_pts_info(vst, 32, 1, 300);
      47             : 
      48           1 :     ret = avio_size(s->pb);
      49           1 :     if (ret < 0) {
      50           0 :         av_log(s, AV_LOG_WARNING, "Cannot calculate duration as file size cannot be determined\n");
      51             :     } else
      52           1 :         vst->duration = (ret * vst->time_base.den) / (CDG_PACKET_SIZE * 300);
      53             : 
      54           1 :     return 0;
      55             : }
      56             : 
      57         213 : static int read_packet(AVFormatContext *s, AVPacket *pkt)
      58             : {
      59         213 :     CDGContext *priv = s->priv_data;
      60             :     int ret;
      61             : 
      62             :     while (1) {
      63         391 :         ret = av_get_packet(s->pb, pkt, CDG_PACKET_SIZE);
      64         302 :         if (ret < 1 || (pkt->data[0] & CDG_MASK) == CDG_COMMAND)
      65             :             break;
      66          89 :         av_packet_unref(pkt);
      67             :     }
      68             : 
      69         213 :     if (!priv->got_first_packet) {
      70           1 :         pkt->flags |= AV_PKT_FLAG_KEY;
      71           1 :         priv->got_first_packet = 1;
      72             :     }
      73             : 
      74         213 :     pkt->stream_index = 0;
      75         213 :     pkt->dts=
      76         213 :     pkt->pts= pkt->pos / CDG_PACKET_SIZE;
      77             : 
      78         213 :     if(ret>5 && (pkt->data[0]&0x3F) == 9 && (pkt->data[1]&0x3F)==1 && !(pkt->data[2+2+1] & 0x0F)){
      79           1 :         pkt->flags = AV_PKT_FLAG_KEY;
      80             :     }
      81         213 :     return ret;
      82             : }
      83             : 
      84             : AVInputFormat ff_cdg_demuxer = {
      85             :     .name           = "cdg",
      86             :     .long_name      = NULL_IF_CONFIG_SMALL("CD Graphics"),
      87             :     .priv_data_size = sizeof(CDGContext),
      88             :     .read_header    = read_header,
      89             :     .read_packet    = read_packet,
      90             :     .flags          = AVFMT_GENERIC_INDEX,
      91             :     .extensions     = "cdg",
      92             : };

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