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n3.4.14
libavformat/msf.c
112 строк
4 KB
Michael Niedermayer
avformat/msf: Check that channels doesnt overflow during extradata construction
11 сен 2021, 22:23
11 сен 2021, 22:23
159ec5a
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/* * MSF demuxer * Copyright (c) 2015 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 "internal.h" static int msf_probe(AVProbeData *p) { if (memcmp(p->buf, "MSF", 3)) return 0; if (AV_RB32(p->buf+8) <= 0) return 0; if (AV_RB32(p->buf+16) <= 0) return 0; if (AV_RB32(p->buf+4) > 16) return AVPROBE_SCORE_MAX / 5; //unsupported / unknown codec return AVPROBE_SCORE_MAX / 3 * 2; } static int msf_read_header(AVFormatContext *s) { unsigned codec, size; AVStream *st; int ret; avio_skip(s->pb, 4); st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; codec = avio_rb32(s->pb); st->codecpar->channels = avio_rb32(s->pb); if (st->codecpar->channels <= 0 || st->codecpar->channels >= INT_MAX / 1024) return AVERROR_INVALIDDATA; size = avio_rb32(s->pb); st->codecpar->sample_rate = avio_rb32(s->pb); if (st->codecpar->sample_rate <= 0) return AVERROR_INVALIDDATA; // avio_rb32(s->pb); /* byte flags with encoder info */ switch (codec) { case 0: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE; break; case 1: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; break; case 3: st->codecpar->block_align = 16 * st->codecpar->channels; st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break; case 4: case 5: case 6: st->codecpar->block_align = (codec == 4 ? 96 : codec == 5 ? 152 : 192) * st->codecpar->channels; if (st->codecpar->channels > UINT16_MAX / 2048) return AVERROR_INVALIDDATA; ret = ff_alloc_extradata(st->codecpar, 14); if (ret < 0) return ret; memset(st->codecpar->extradata, 0, st->codecpar->extradata_size); AV_WL16(st->codecpar->extradata, 1); /* version */ AV_WL16(st->codecpar->extradata+2, 2048 * st->codecpar->channels); /* unknown size */ AV_WL16(st->codecpar->extradata+6, codec == 4 ? 1 : 0); /* joint stereo */ AV_WL16(st->codecpar->extradata+8, codec == 4 ? 1 : 0); /* joint stereo (repeat?) */ AV_WL16(st->codecpar->extradata+10, 1); st->codecpar->codec_id = AV_CODEC_ID_ATRAC3; break; case 7: st->need_parsing = AVSTREAM_PARSE_FULL_RAW; st->codecpar->codec_id = AV_CODEC_ID_MP3; break; default: avpriv_request_sample(s, "Codec %d", codec); return AVERROR_PATCHWELCOME; } st->duration = av_get_audio_frame_duration2(st->codecpar, size); avio_skip(s->pb, 0x40 - avio_tell(s->pb)); avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); return 0; } static int msf_read_packet(AVFormatContext *s, AVPacket *pkt) { AVCodecParameters *par = s->streams[0]->codecpar; return av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->channels); } AVInputFormat ff_msf_demuxer = { .name = "msf", .long_name = NULL_IF_CONFIG_SMALL("Sony PS3 MSF"), .read_probe = msf_probe, .read_header = msf_read_header, .read_packet = msf_read_packet, .extensions = "msf", };