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