140 lines
4.2 KiB
C
Executable file
140 lines
4.2 KiB
C
Executable file
/*
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* AIX demuxer
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* Copyright (c) 2016 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 "avformat.h"
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#include "internal.h"
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static int aix_probe(const AVProbeData *p)
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{
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if (AV_RL32(p->buf) != MKTAG('A','I','X','F') ||
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AV_RB32(p->buf + 8) != 0x01000014 ||
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AV_RB32(p->buf + 12) != 0x00000800)
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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static int aix_read_header(AVFormatContext *s)
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{
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unsigned nb_streams, first_offset, nb_segments;
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unsigned stream_list_offset;
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unsigned segment_list_offset = 0x20;
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unsigned segment_list_entry_size = 0x10;
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unsigned size;
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int i;
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avio_skip(s->pb, 4);
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first_offset = avio_rb32(s->pb) + 8;
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avio_skip(s->pb, 16);
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nb_segments = avio_rb16(s->pb);
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if (nb_segments == 0)
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return AVERROR_INVALIDDATA;
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stream_list_offset = segment_list_offset + segment_list_entry_size * nb_segments + 0x10;
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if (stream_list_offset >= first_offset)
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return AVERROR_INVALIDDATA;
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avio_seek(s->pb, stream_list_offset, SEEK_SET);
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nb_streams = avio_r8(s->pb);
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if (nb_streams == 0)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 7);
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for (i = 0; i < nb_streams; i++) {
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AVStream *st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_id = AV_CODEC_ID_ADPCM_ADX;
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st->codecpar->sample_rate = avio_rb32(s->pb);
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st->codecpar->channels = avio_r8(s->pb);
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
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avio_skip(s->pb, 3);
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}
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avio_seek(s->pb, first_offset, SEEK_SET);
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for (i = 0; i < nb_streams; i++) {
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if (avio_rl32(s->pb) != MKTAG('A','I','X','P'))
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return AVERROR_INVALIDDATA;
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size = avio_rb32(s->pb);
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if (size <= 8)
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return AVERROR_INVALIDDATA;
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avio_skip(s->pb, 8);
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ff_get_extradata(s, s->streams[i]->codecpar, s->pb, size - 8);
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}
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return 0;
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}
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static int aix_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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unsigned size, index, duration, chunk;
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int64_t pos;
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int sequence, ret, i;
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pos = avio_tell(s->pb);
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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chunk = avio_rl32(s->pb);
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size = avio_rb32(s->pb);
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if (chunk == MKTAG('A','I','X','E')) {
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avio_skip(s->pb, size);
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for (i = 0; i < s->nb_streams; i++) {
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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chunk = avio_rl32(s->pb);
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size = avio_rb32(s->pb);
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avio_skip(s->pb, size);
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}
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pos = avio_tell(s->pb);
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chunk = avio_rl32(s->pb);
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size = avio_rb32(s->pb);
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}
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if (chunk != MKTAG('A','I','X','P'))
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return AVERROR_INVALIDDATA;
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if (size <= 8)
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return AVERROR_INVALIDDATA;
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index = avio_r8(s->pb);
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if (avio_r8(s->pb) != s->nb_streams || index >= s->nb_streams)
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return AVERROR_INVALIDDATA;
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duration = avio_rb16(s->pb);
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sequence = avio_rb32(s->pb);
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if (sequence < 0) {
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avio_skip(s->pb, size - 8);
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return 0;
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}
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ret = av_get_packet(s->pb, pkt, size - 8);
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pkt->stream_index = index;
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pkt->duration = duration;
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pkt->pos = pos;
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return ret;
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}
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AVInputFormat ff_aix_demuxer = {
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.name = "aix",
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.long_name = NULL_IF_CONFIG_SMALL("CRI AIX"),
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.read_probe = aix_probe,
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.read_header = aix_read_header,
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.read_packet = aix_read_packet,
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.extensions = "aix",
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.flags = AVFMT_GENERIC_INDEX,
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};
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