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91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
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* HCOM demuxer
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* Copyright (c) 2019 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/intreadwrite.h"
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#include "avformat.h"
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#include "internal.h"
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#include "pcm.h"
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static int hcom_probe(const AVProbeData *p)
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{
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if (p->buf_size < 132)
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return 0;
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if (!memcmp(p->buf+65, "FSSD", 4) &&
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!memcmp(p->buf+128, "HCOM", 4))
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static int hcom_read_header(AVFormatContext *s)
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{
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AVStream *st;
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av_unused unsigned data_size, rsrc_size, huffcount;
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unsigned compresstype, divisor;
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unsigned dict_entries;
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int ret;
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avio_skip(s->pb, 83);
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data_size = avio_rb32(s->pb);
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rsrc_size = avio_rb32(s->pb);
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avio_skip(s->pb, 128-91+4);
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huffcount = avio_rb32(s->pb);
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avio_skip(s->pb, 4);
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compresstype = avio_rb32(s->pb);
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if (compresstype > 1)
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return AVERROR_INVALIDDATA;
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divisor = avio_rb32(s->pb);
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if (divisor == 0 || divisor > 4)
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return AVERROR_INVALIDDATA;
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dict_entries = avio_rb16(s->pb);
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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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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->ch_layout.nb_channels = 1;
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st->codecpar->sample_rate = 22050 / divisor;
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st->codecpar->codec_id = AV_CODEC_ID_HCOM;
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st->codecpar->bits_per_coded_sample = 8;
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st->codecpar->block_align = 4;
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ret = ff_alloc_extradata(st->codecpar, dict_entries * 4 + 7);
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if (ret < 0)
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return ret;
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AV_WB16(st->codecpar->extradata, dict_entries);
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AV_WB32(st->codecpar->extradata + 2, compresstype);
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avio_read(s->pb, st->codecpar->extradata + 6, dict_entries * 4);
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avio_skip(s->pb, 1);
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st->codecpar->extradata[dict_entries * 4 + 6] = avio_r8(s->pb);
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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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const AVInputFormat ff_hcom_demuxer = {
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.name = "hcom",
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.long_name = NULL_IF_CONFIG_SMALL("Macintosh HCOM"),
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.read_probe = hcom_probe,
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.read_header = hcom_read_header,
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.read_packet = ff_pcm_read_packet,
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};
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