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90 lines
2.8 KiB
90 lines
2.8 KiB
/* |
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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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