| /* |
| * 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 "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->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; |
| } |
| |
| AVInputFormat ff_aix_demuxer = { |
| .name = "aix", |
| .long_name = NULL_IF_CONFIG_SMALL("CRI AIX"), |
| .read_probe = aix_probe, |
| .read_header = aix_read_header, |
| .read_packet = aix_read_packet, |
| .extensions = "aix", |
| .flags = AVFMT_GENERIC_INDEX, |
| }; |