| /* |
| * 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/intreadwrite.h" |
| #include "libavcodec/bytestream.h" |
| |
| #include "avformat.h" |
| #include "internal.h" |
| |
| static int hca_probe(const AVProbeData *p) |
| { |
| if (AV_RL32(p->buf) != MKTAG('H', 'C', 'A', 0)) |
| return 0; |
| |
| if (AV_RL32(p->buf + 8) != MKTAG('f', 'm', 't', 0)) |
| return 0; |
| |
| return AVPROBE_SCORE_MAX / 3; |
| } |
| |
| static int hca_read_header(AVFormatContext *s) |
| { |
| AVCodecParameters *par; |
| GetByteContext gb; |
| AVIOContext *pb = s->pb; |
| AVStream *st; |
| uint32_t chunk; |
| uint16_t version; |
| uint32_t block_count; |
| uint16_t block_size; |
| int ret; |
| |
| avio_skip(pb, 4); |
| version = avio_rb16(pb); |
| |
| s->internal->data_offset = avio_rb16(pb); |
| if (s->internal->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, s->internal->data_offset); |
| if (ret < 0) |
| return ret; |
| |
| ret = avio_read(pb, par->extradata + 8, par->extradata_size - 8); |
| if (ret < par->extradata_size - 8) |
| return AVERROR(EIO); |
| AV_WL32(par->extradata, MKTAG('H', 'C', 'A', 0)); |
| AV_WB16(par->extradata + 4, version); |
| AV_WB16(par->extradata + 6, s->internal->data_offset); |
| |
| bytestream2_init(&gb, par->extradata + 8, par->extradata_size - 8); |
| |
| if (bytestream2_get_le32(&gb) != 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; |
| par->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); |
| 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, s->internal->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; |
| } |
| |
| AVInputFormat ff_hca_demuxer = { |
| .name = "hca", |
| .long_name = NULL_IF_CONFIG_SMALL("CRI HCA"), |
| .read_probe = hca_probe, |
| .read_header = hca_read_header, |
| .read_packet = hca_read_packet, |
| .extensions = "hca", |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |