mirror of https://git.ffmpeg.org/ffmpeg.git
97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
/*
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* SVS demuxer
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* Copyright (c) 2020 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 "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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static int svs_probe(const AVProbeData *p)
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{
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if (p->buf_size < 32)
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return 0;
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if (memcmp(p->buf, "SVS\00", 4))
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return 0;
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if (AV_RL32(p->buf + 16) == 0)
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return 0;
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return AVPROBE_SCORE_MAX / 3;
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}
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static int svs_read_header(AVFormatContext *s)
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{
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AVStream *st;
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uint32_t pitch;
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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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avio_skip(s->pb, 16);
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pitch = avio_rl32(s->pb);
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avio_skip(s->pb, 12);
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s->internal->data_offset = avio_tell(s->pb);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
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st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
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st->codecpar->channels = 2;
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st->codecpar->sample_rate = av_rescale_rnd(pitch, 48000, 4096, AV_ROUND_INF);
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st->codecpar->block_align = 32;
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st->start_time = 0;
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if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
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st->duration = av_get_audio_frame_duration2(st->codecpar,
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avio_size(s->pb) - 32);
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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return 0;
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}
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static int svs_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret;
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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ret = av_get_packet(s->pb, pkt, 32 * 256);
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if (ret != 32 * 256) {
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if (ret < 0)
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return ret;
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
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}
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pkt->stream_index = 0;
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return ret;
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}
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AVInputFormat ff_svs_demuxer = {
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.name = "svs",
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.long_name = NULL_IF_CONFIG_SMALL("Square SVS"),
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.read_probe = svs_probe,
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.read_header = svs_read_header,
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.read_packet = svs_read_packet,
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.extensions = "svs",
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};
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