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https://git.ffmpeg.org/ffmpeg.git
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125 lines
3.5 KiB
C
125 lines
3.5 KiB
C
/*
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* HCA 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/intreadwrite.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "internal.h"
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static int hca_probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) != MKTAG('H', 'C', 'A', 0))
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return 0;
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if (AV_RL32(p->buf + 8) != MKTAG('f', 'm', 't', 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 hca_read_header(AVFormatContext *s)
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{
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AVCodecParameters *par;
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GetByteContext gb;
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AVIOContext *pb = s->pb;
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AVStream *st;
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uint32_t chunk;
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uint16_t version;
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uint32_t block_count;
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uint16_t block_size, data_offset;
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int ret;
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avio_skip(pb, 4);
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version = avio_rb16(pb);
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data_offset = avio_rb16(pb);
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if (data_offset <= 8)
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return AVERROR_INVALIDDATA;
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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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par = st->codecpar;
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ret = ff_alloc_extradata(par, data_offset);
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if (ret < 0)
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return ret;
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ret = avio_read(pb, par->extradata + 8, par->extradata_size - 8);
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if (ret < par->extradata_size - 8)
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return AVERROR(EIO);
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AV_WL32(par->extradata, MKTAG('H', 'C', 'A', 0));
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AV_WB16(par->extradata + 4, version);
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AV_WB16(par->extradata + 6, data_offset);
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bytestream2_init(&gb, par->extradata + 8, par->extradata_size - 8);
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if (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', 0))
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return AVERROR_INVALIDDATA;
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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par->codec_id = AV_CODEC_ID_HCA;
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par->codec_tag = 0;
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st->codecpar->ch_layout.nb_channels = bytestream2_get_byte(&gb);
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par->sample_rate = bytestream2_get_be24(&gb);
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block_count = bytestream2_get_be32(&gb);
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bytestream2_skip(&gb, 4);
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chunk = bytestream2_get_le32(&gb);
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if (chunk == MKTAG('c', 'o', 'm', 'p')) {
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block_size = bytestream2_get_be16(&gb);
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} else if (chunk == MKTAG('d', 'e', 'c', 0)) {
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block_size = bytestream2_get_be16(&gb);
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} else {
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return AVERROR_INVALIDDATA;
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}
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if (block_size < 8)
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return AVERROR_INVALIDDATA;
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par->block_align = block_size;
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st->duration = 1024 * block_count;
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avio_seek(pb, data_offset, SEEK_SET);
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avpriv_set_pts_info(st, 64, 1, par->sample_rate);
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return 0;
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}
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static int hca_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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AVCodecParameters *par = s->streams[0]->codecpar;
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int ret;
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ret = av_get_packet(s->pb, pkt, par->block_align);
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pkt->duration = 1024;
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return ret;
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}
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const AVInputFormat ff_hca_demuxer = {
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.name = "hca",
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.long_name = NULL_IF_CONFIG_SMALL("CRI HCA"),
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.read_probe = hca_probe,
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.read_header = hca_read_header,
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.read_packet = hca_read_packet,
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.extensions = "hca",
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.flags = AVFMT_GENERIC_INDEX,
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};
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