LCOV - code coverage report
Current view: top level - libavformat - vpk.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 53 5.7 %
Date: 2017-12-18 20:14:19 Functions: 1 3 33.3 %

          Line data    Source code
       1             : /*
       2             :  * VPK demuxer
       3             :  * Copyright (c) 2015 Paul B Mahol
       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 "libavutil/intreadwrite.h"
      23             : #include "avformat.h"
      24             : #include "internal.h"
      25             : 
      26             : typedef struct VPKDemuxContext {
      27             :     unsigned block_count;
      28             :     unsigned current_block;
      29             :     unsigned last_block_size;
      30             : } VPKDemuxContext;
      31             : 
      32        6130 : static int vpk_probe(AVProbeData *p)
      33             : {
      34        6130 :     if (AV_RL32(p->buf) != MKBETAG('V','P','K',' '))
      35        6130 :         return 0;
      36             : 
      37           0 :     return AVPROBE_SCORE_MAX / 3 * 2;
      38             : }
      39             : 
      40           0 : static int vpk_read_header(AVFormatContext *s)
      41             : {
      42           0 :     VPKDemuxContext *vpk = s->priv_data;
      43             :     unsigned offset;
      44             :     unsigned samples_per_block;
      45             :     AVStream *st;
      46             : 
      47           0 :     vpk->current_block = 0;
      48           0 :     st = avformat_new_stream(s, NULL);
      49           0 :     if (!st)
      50           0 :         return AVERROR(ENOMEM);
      51             : 
      52           0 :     avio_skip(s->pb, 4);
      53           0 :     st->duration           = avio_rl32(s->pb) * 28 / 16;
      54           0 :     offset                 = avio_rl32(s->pb);
      55           0 :     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
      56           0 :     st->codecpar->codec_id    = AV_CODEC_ID_ADPCM_PSX;
      57           0 :     st->codecpar->block_align = avio_rl32(s->pb);
      58           0 :     st->codecpar->sample_rate = avio_rl32(s->pb);
      59           0 :     if (st->codecpar->sample_rate <= 0)
      60           0 :         return AVERROR_INVALIDDATA;
      61           0 :     st->codecpar->channels    = avio_rl32(s->pb);
      62           0 :     if (st->codecpar->channels <= 0)
      63           0 :         return AVERROR_INVALIDDATA;
      64           0 :     samples_per_block      = ((st->codecpar->block_align / st->codecpar->channels) * 28) / 16;
      65           0 :     if (samples_per_block <= 0)
      66           0 :         return AVERROR_INVALIDDATA;
      67           0 :     vpk->block_count       = (st->duration + (samples_per_block - 1)) / samples_per_block;
      68           0 :     vpk->last_block_size   = (st->duration % samples_per_block) * 16 * st->codecpar->channels / 28;
      69           0 :     avio_skip(s->pb, offset - avio_tell(s->pb));
      70           0 :     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
      71             : 
      72           0 :     return 0;
      73             : }
      74             : 
      75           0 : static int vpk_read_packet(AVFormatContext *s, AVPacket *pkt)
      76             : {
      77           0 :     AVCodecParameters *par = s->streams[0]->codecpar;
      78           0 :     VPKDemuxContext *vpk = s->priv_data;
      79             :     int ret, i;
      80             : 
      81           0 :     vpk->current_block++;
      82           0 :     if (vpk->current_block == vpk->block_count) {
      83           0 :         unsigned size = vpk->last_block_size / par->channels;
      84           0 :         unsigned skip = (par->block_align - vpk->last_block_size) / par->channels;
      85             : 
      86           0 :         ret = av_new_packet(pkt, vpk->last_block_size);
      87           0 :         if (ret < 0)
      88           0 :             return ret;
      89           0 :         for (i = 0; i < par->channels; i++) {
      90           0 :             ret = avio_read(s->pb, pkt->data + i * size, size);
      91           0 :             avio_skip(s->pb, skip);
      92           0 :             if (ret != size) {
      93           0 :                 av_packet_unref(pkt);
      94           0 :                 ret = AVERROR(EIO);
      95           0 :                 break;
      96             :             }
      97             :         }
      98           0 :         pkt->stream_index = 0;
      99           0 :     } else if (vpk->current_block < vpk->block_count) {
     100           0 :         ret = av_get_packet(s->pb, pkt, par->block_align);
     101           0 :         pkt->stream_index = 0;
     102             :     } else {
     103           0 :         return AVERROR_EOF;
     104             :     }
     105             : 
     106           0 :     return ret;
     107             : }
     108             : 
     109             : AVInputFormat ff_vpk_demuxer = {
     110             :     .name           = "vpk",
     111             :     .long_name      = NULL_IF_CONFIG_SMALL("Sony PS2 VPK"),
     112             :     .priv_data_size = sizeof(VPKDemuxContext),
     113             :     .read_probe     = vpk_probe,
     114             :     .read_header    = vpk_read_header,
     115             :     .read_packet    = vpk_read_packet,
     116             :     .extensions     = "vpk",
     117             : };

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