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94 lines
2.6 KiB
94 lines
2.6 KiB
/* |
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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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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->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; |
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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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const 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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