mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
|
|
* HCOM demuxer
|
|
* Copyright (c) 2019 Paul B Mahol
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
#include "pcm.h"
|
|
|
|
static int hcom_probe(const AVProbeData *p)
|
|
{
|
|
if (p->buf_size < 132)
|
|
return 0;
|
|
if (!memcmp(p->buf+65, "FSSD", 4) &&
|
|
!memcmp(p->buf+128, "HCOM", 4))
|
|
return AVPROBE_SCORE_MAX;
|
|
return 0;
|
|
}
|
|
|
|
static int hcom_read_header(AVFormatContext *s)
|
|
{
|
|
AVStream *st;
|
|
av_unused unsigned data_size, rsrc_size, huffcount;
|
|
unsigned compresstype, divisor;
|
|
unsigned dict_entries;
|
|
int ret;
|
|
|
|
avio_skip(s->pb, 83);
|
|
data_size = avio_rb32(s->pb);
|
|
rsrc_size = avio_rb32(s->pb);
|
|
avio_skip(s->pb, 128-91+4);
|
|
huffcount = avio_rb32(s->pb);
|
|
avio_skip(s->pb, 4);
|
|
compresstype = avio_rb32(s->pb);
|
|
if (compresstype > 1)
|
|
return AVERROR_INVALIDDATA;
|
|
divisor = avio_rb32(s->pb);
|
|
if (divisor == 0 || divisor > 4)
|
|
return AVERROR_INVALIDDATA;
|
|
dict_entries = avio_rb16(s->pb);
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->ch_layout.nb_channels = 1;
|
|
st->codecpar->sample_rate = 22050 / divisor;
|
|
st->codecpar->codec_id = AV_CODEC_ID_HCOM;
|
|
st->codecpar->bits_per_coded_sample = 8;
|
|
st->codecpar->block_align = 4;
|
|
|
|
ret = ff_alloc_extradata(st->codecpar, dict_entries * 4 + 7);
|
|
if (ret < 0)
|
|
return ret;
|
|
AV_WB16(st->codecpar->extradata, dict_entries);
|
|
AV_WB32(st->codecpar->extradata + 2, compresstype);
|
|
avio_read(s->pb, st->codecpar->extradata + 6, dict_entries * 4);
|
|
avio_skip(s->pb, 1);
|
|
st->codecpar->extradata[dict_entries * 4 + 6] = avio_r8(s->pb);
|
|
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const AVInputFormat ff_hcom_demuxer = {
|
|
.name = "hcom",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Macintosh HCOM"),
|
|
.read_probe = hcom_probe,
|
|
.read_header = hcom_read_header,
|
|
.read_packet = ff_pcm_read_packet,
|
|
};
|