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78 lines
2.4 KiB
78 lines
2.4 KiB
/* |
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* SVAG demuxer |
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* Copyright (c) 2015 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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#include "internal.h" |
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static int svag_probe(AVProbeData *p) |
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{ |
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if (memcmp(p->buf, "Svag", 4)) |
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return 0; |
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return AVPROBE_SCORE_MAX; |
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} |
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static int svag_read_header(AVFormatContext *s) |
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{ |
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unsigned size, align; |
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AVStream *st; |
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avio_skip(s->pb, 4); |
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st = avformat_new_stream(s, NULL); |
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if (!st) |
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return AVERROR(ENOMEM); |
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size = avio_rl32(s->pb); |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_id = AV_CODEC_ID_ADPCM_PSX; |
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st->codec->sample_rate = avio_rl32(s->pb); |
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if (st->codec->sample_rate <= 0) |
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return AVERROR_INVALIDDATA; |
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st->codec->channels = avio_rl32(s->pb); |
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if (st->codec->channels <= 0) |
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return AVERROR_INVALIDDATA; |
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st->duration = size / (16 * st->codec->channels) * 28; |
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align = avio_rl32(s->pb); |
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if (align <= 0 || align > INT_MAX / st->codec->channels) |
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return AVERROR_INVALIDDATA; |
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st->codec->block_align = align * st->codec->channels; |
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avio_skip(s->pb, 0x800 - avio_tell(s->pb)); |
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avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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return 0; |
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} |
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static int svag_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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AVCodecContext *codec = s->streams[0]->codec; |
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return av_get_packet(s->pb, pkt, codec->block_align); |
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} |
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AVInputFormat ff_svag_demuxer = { |
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.name = "svag", |
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.long_name = NULL_IF_CONFIG_SMALL("SVAG"), |
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.read_probe = svag_probe, |
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.read_header = svag_read_header, |
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.read_packet = svag_read_packet, |
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.extensions = "svag", |
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};
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