libavformat/xvag.c

   1 /*
   2  * XVAG 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/bswap.h"
  23 #include "libavcodec/internal.h"
  24 #include "avformat.h"
  25 #include "demux.h"
  26 #include "internal.h"
  27
  28 static int xvag_probe(const AVProbeData *p)
  29 {
  30     if (memcmp(p->buf, "XVAG", 4) ||
  31         memcmp(p->buf+32, "fmat", 4))
  32         return 0;
  33
  34     return AVPROBE_SCORE_MAX;
  35 }
  36
  37 static int xvag_read_header(AVFormatContext *s)
  38 {
  39     unsigned offset, big_endian, codec;
  40     AVStream *st;
  41
  42     avio_skip(s->pb, 4);
  43
  44     st = avformat_new_stream(s, NULL);
  45     if (!st)
  46         return AVERROR(ENOMEM);
  47
  48     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
  49
  50     offset     = avio_rl32(s->pb);
  51     big_endian = offset > av_bswap32(offset);
  52     if (big_endian) {
  53         offset                 = av_bswap32(offset);
  54         avio_skip(s->pb, 28);
  55         codec                  = avio_rb32(s->pb);
  56         st->codecpar->ch_layout.nb_channels = avio_rb32(s->pb);
  57         avio_skip(s->pb, 4);
  58         st->duration           = avio_rb32(s->pb);
  59         avio_skip(s->pb, 8);
  60         st->codecpar->sample_rate = avio_rb32(s->pb);
  61     } else {
  62         avio_skip(s->pb, 28);
  63         codec                  = avio_rl32(s->pb);
  64         st->codecpar->ch_layout.nb_channels = avio_rl32(s->pb);
  65         avio_skip(s->pb, 4);
  66         st->duration           = avio_rl32(s->pb);
  67         avio_skip(s->pb, 8);
  68         st->codecpar->sample_rate = avio_rl32(s->pb);
  69     }
  70
  71     if (st->codecpar->sample_rate <= 0)
  72         return AVERROR_INVALIDDATA;
  73     if (st->codecpar->ch_layout.nb_channels <= 0 ||
  74         st->codecpar->ch_layout.nb_channels > FF_SANE_NB_CHANNELS)
  75         return AVERROR_INVALIDDATA;
  76
  77     switch (codec) {
  78     case 0x1c:
  79         st->codecpar->codec_id    = AV_CODEC_ID_ADPCM_PSX;
  80         st->codecpar->block_align = 16 * st->codecpar->ch_layout.nb_channels;
  81         break;
  82     default:
  83         avpriv_request_sample(s, "codec %X", codec);
  84         return AVERROR_PATCHWELCOME;
  85     };
  86
  87     avio_skip(s->pb, offset - avio_tell(s->pb));
  88
  89     if (avio_rb16(s->pb) == 0xFFFB) {
  90         st->codecpar->codec_id    = AV_CODEC_ID_MP3;
  91         st->codecpar->block_align = 0x1000;
  92         ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
  93     }
  94
  95     avio_skip(s->pb, -2);
  96     avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
  97
  98     return 0;
  99 }
 100
 101 static int xvag_read_packet(AVFormatContext *s, AVPacket *pkt)
 102 {
 103     AVCodecParameters *par = s->streams[0]->codecpar;
 104
 105     return av_get_packet(s->pb, pkt, par->block_align);
 106 }
 107
 108 const FFInputFormat ff_xvag_demuxer = {
 109     .p.name         = "xvag",
 110     .p.long_name    = NULL_IF_CONFIG_SMALL("Sony PS3 XVAG"),
 111     .p.extensions   = "xvag",
 112     .read_probe     = xvag_probe,
 113     .read_header    = xvag_read_header,
 114     .read_packet    = xvag_read_packet,
 115 };