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124 lines
3.6 KiB
124 lines
3.6 KiB
/* |
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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; |
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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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s->internal->data_offset = avio_rb16(pb); |
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if (s->internal->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, s->internal->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, s->internal->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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par->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, s->internal->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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