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/*
* HCA demuxer
* Copyright (c) 2020 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/opt.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/bytestream.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
#define HCA_MASK 0x7f7f7f7f
typedef struct HCADemuxContext {
AVClass *class;
int64_t keyl;
int64_t keyh;
int subkey;
} HCADemuxContext;
static int hca_probe(const AVProbeData *p)
{
if ((AV_RL32(p->buf) & HCA_MASK) != MKTAG('H', 'C', 'A', 0))
return 0;
if ((AV_RL32(p->buf + 8) & HCA_MASK) != MKTAG('f', 'm', 't', 0))
return 0;
return AVPROBE_SCORE_MAX / 3;
}
static int hca_read_header(AVFormatContext *s)
{
HCADemuxContext *hca = s->priv_data;
AVCodecParameters *par;
GetByteContext gb;
AVIOContext *pb = s->pb;
AVStream *st;
uint32_t chunk;
uint16_t version;
uint32_t block_count;
uint16_t block_size, data_offset;
int ret;
avio_skip(pb, 4);
version = avio_rb16(pb);
data_offset = avio_rb16(pb);
if (data_offset <= 8)
return AVERROR_INVALIDDATA;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
par = st->codecpar;
ret = ff_alloc_extradata(par, data_offset + 10);
if (ret < 0)
return ret;
ret = avio_read(pb, par->extradata + 8, par->extradata_size - 8 - 10);
if (ret < par->extradata_size - 8 - 10)
return AVERROR(EIO);
AV_WL32(par->extradata, MKTAG('H', 'C', 'A', 0));
AV_WB16(par->extradata + 4, version);
AV_WB16(par->extradata + 6, data_offset);
AV_WB32(par->extradata + par->extradata_size - 10, hca->keyh);
AV_WB32(par->extradata + par->extradata_size - 6, hca->keyl);
AV_WB16(par->extradata + par->extradata_size - 2, hca->subkey);
bytestream2_init(&gb, par->extradata + 8, par->extradata_size - 8);
if ((bytestream2_get_le32(&gb) & HCA_MASK) != MKTAG('f', 'm', 't', 0))
return AVERROR_INVALIDDATA;
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->codec_id = AV_CODEC_ID_HCA;
par->codec_tag = 0;
st->codecpar->ch_layout.nb_channels = bytestream2_get_byte(&gb);
par->sample_rate = bytestream2_get_be24(&gb);
block_count = bytestream2_get_be32(&gb);
bytestream2_skip(&gb, 4);
chunk = bytestream2_get_le32(&gb) & HCA_MASK;
if (chunk == MKTAG('c', 'o', 'm', 'p')) {
block_size = bytestream2_get_be16(&gb);
} else if (chunk == MKTAG('d', 'e', 'c', 0)) {
block_size = bytestream2_get_be16(&gb);
} else {
return AVERROR_INVALIDDATA;
}
if (block_size < 8)
return AVERROR_INVALIDDATA;
par->block_align = block_size;
st->duration = 1024 * block_count;
avio_seek(pb, data_offset, SEEK_SET);
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
return 0;
}
static int hca_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVCodecParameters *par = s->streams[0]->codecpar;
int ret;
ret = av_get_packet(s->pb, pkt, par->block_align);
pkt->duration = 1024;
return ret;
}
#define OFFSET(x) offsetof(HCADemuxContext, x)
static const AVOption hca_options[] = {
{ "hca_lowkey",
"Low key used for handling CRI HCA files", OFFSET(keyl),
AV_OPT_TYPE_INT64, {.i64=0}, .min = 0, .max = UINT32_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM, },
{ "hca_highkey",
"High key used for handling CRI HCA files", OFFSET(keyh),
AV_OPT_TYPE_INT64, {.i64=0}, .min = 0, .max = UINT32_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM, },
{ "hca_subkey",
"Subkey used for handling CRI HCA files", OFFSET(subkey),
AV_OPT_TYPE_INT, {.i64=0}, .min = 0, .max = UINT16_MAX, .flags = AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass hca_class = {
.class_name = "hca",
.item_name = av_default_item_name,
.option = hca_options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFInputFormat ff_hca_demuxer = {
.p.name = "hca",
.p.long_name = NULL_IF_CONFIG_SMALL("CRI HCA"),
.p.priv_class = &hca_class,
.p.extensions = "hca",
.p.flags = AVFMT_GENERIC_INDEX,
.priv_data_size = sizeof(HCADemuxContext),
.read_probe = hca_probe,
.read_header = hca_read_header,
.read_packet = hca_read_packet,
};
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