Line data    Source code

       1             : /*
       2             :  * SVAG 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 "avformat.h"
      23             : #include "internal.h"
      24             : 
      25        6217 : static int svag_probe(AVProbeData *p)
      26             : {
      27        6217 :     if (memcmp(p->buf, "Svag", 4))
      28        6217 :         return 0;
      29             : 
      30           0 :     return AVPROBE_SCORE_MAX;
      31             : }
      32             : 
      33           0 : static int svag_read_header(AVFormatContext *s)
      34             : {
      35             :     unsigned size, align;
      36             :     AVStream *st;
      37             : 
      38           0 :     avio_skip(s->pb, 4);
      39             : 
      40           0 :     st = avformat_new_stream(s, NULL);
      41           0 :     if (!st)
      42           0 :         return AVERROR(ENOMEM);
      43             : 
      44           0 :     size                   = avio_rl32(s->pb);
      45           0 :     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
      46           0 :     st->codecpar->codec_id    = AV_CODEC_ID_ADPCM_PSX;
      47           0 :     st->codecpar->sample_rate = avio_rl32(s->pb);
      48           0 :     if (st->codecpar->sample_rate <= 0)
      49           0 :         return AVERROR_INVALIDDATA;
      50           0 :     st->codecpar->channels    = avio_rl32(s->pb);
      51           0 :     if (st->codecpar->channels <= 0 || st->codecpar->channels > 8)
      52           0 :         return AVERROR_INVALIDDATA;
      53           0 :     st->duration           = size / (16 * st->codecpar->channels) * 28;
      54           0 :     align                  = avio_rl32(s->pb);
      55           0 :     if (align <= 0 || align > INT_MAX / st->codecpar->channels)
      56           0 :         return AVERROR_INVALIDDATA;
      57           0 :     st->codecpar->block_align = align * st->codecpar->channels;
      58           0 :     avio_skip(s->pb, 0x800 - avio_tell(s->pb));
      59           0 :     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
      60             : 
      61           0 :     return 0;
      62             : }
      63             : 
      64           0 : static int svag_read_packet(AVFormatContext *s, AVPacket *pkt)
      65             : {
      66           0 :     AVCodecParameters *par = s->streams[0]->codecpar;
      67             : 
      68           0 :     return av_get_packet(s->pb, pkt, par->block_align);
      69             : }
      70             : 
      71             : AVInputFormat ff_svag_demuxer = {
      72             :     .name           = "svag",
      73             :     .long_name      = NULL_IF_CONFIG_SMALL("Konami PS2 SVAG"),
      74             :     .read_probe     = svag_probe,
      75             :     .read_header    = svag_read_header,
      76             :     .read_packet    = svag_read_packet,
      77             :     .extensions     = "svag",
      78             : };