| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * AIX demuxer | ||
| 3 | * Copyright (c) 2016 Paul B Mahol | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/intreadwrite.h" | ||
| 23 | #include "avformat.h" | ||
| 24 | #include "demux.h" | ||
| 25 | #include "internal.h" | ||
| 26 | |||
| 27 | 7186 | static int aix_probe(const AVProbeData *p) | |
| 28 | { | ||
| 29 |
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7186 | if (AV_RL32(p->buf) != MKTAG('A','I','X','F') || |
| 30 | ✗ | AV_RB32(p->buf + 8) != 0x01000014 || | |
| 31 | ✗ | AV_RB32(p->buf + 12) != 0x00000800) | |
| 32 | 7186 | return 0; | |
| 33 | |||
| 34 | ✗ | return AVPROBE_SCORE_MAX; | |
| 35 | } | ||
| 36 | |||
| 37 | ✗ | static int aix_read_header(AVFormatContext *s) | |
| 38 | { | ||
| 39 | unsigned nb_streams, first_offset, nb_segments; | ||
| 40 | unsigned stream_list_offset; | ||
| 41 | ✗ | unsigned segment_list_offset = 0x20; | |
| 42 | ✗ | unsigned segment_list_entry_size = 0x10; | |
| 43 | unsigned size; | ||
| 44 | int i; | ||
| 45 | |||
| 46 | ✗ | avio_skip(s->pb, 4); | |
| 47 | ✗ | first_offset = avio_rb32(s->pb) + 8; | |
| 48 | ✗ | avio_skip(s->pb, 16); | |
| 49 | ✗ | nb_segments = avio_rb16(s->pb); | |
| 50 | ✗ | if (nb_segments == 0) | |
| 51 | ✗ | return AVERROR_INVALIDDATA; | |
| 52 | ✗ | stream_list_offset = segment_list_offset + segment_list_entry_size * nb_segments + 0x10; | |
| 53 | ✗ | if (stream_list_offset >= first_offset) | |
| 54 | ✗ | return AVERROR_INVALIDDATA; | |
| 55 | ✗ | avio_seek(s->pb, stream_list_offset, SEEK_SET); | |
| 56 | ✗ | nb_streams = avio_r8(s->pb); | |
| 57 | ✗ | if (nb_streams == 0) | |
| 58 | ✗ | return AVERROR_INVALIDDATA; | |
| 59 | ✗ | avio_skip(s->pb, 7); | |
| 60 | ✗ | for (i = 0; i < nb_streams; i++) { | |
| 61 | ✗ | AVStream *st = avformat_new_stream(s, NULL); | |
| 62 | |||
| 63 | ✗ | if (!st) | |
| 64 | ✗ | return AVERROR(ENOMEM); | |
| 65 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 66 | ✗ | st->codecpar->codec_id = AV_CODEC_ID_ADPCM_ADX; | |
| 67 | ✗ | st->codecpar->sample_rate = avio_rb32(s->pb); | |
| 68 | ✗ | st->codecpar->ch_layout.nb_channels = avio_r8(s->pb); | |
| 69 | ✗ | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
| 70 | ✗ | avio_skip(s->pb, 3); | |
| 71 | } | ||
| 72 | |||
| 73 | ✗ | avio_seek(s->pb, first_offset, SEEK_SET); | |
| 74 | ✗ | for (i = 0; i < nb_streams; i++) { | |
| 75 | ✗ | if (avio_rl32(s->pb) != MKTAG('A','I','X','P')) | |
| 76 | ✗ | return AVERROR_INVALIDDATA; | |
| 77 | ✗ | size = avio_rb32(s->pb); | |
| 78 | ✗ | if (size <= 8) | |
| 79 | ✗ | return AVERROR_INVALIDDATA; | |
| 80 | ✗ | avio_skip(s->pb, 8); | |
| 81 | ✗ | ff_get_extradata(s, s->streams[i]->codecpar, s->pb, size - 8); | |
| 82 | } | ||
| 83 | |||
| 84 | ✗ | return 0; | |
| 85 | } | ||
| 86 | |||
| 87 | ✗ | static int aix_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 88 | { | ||
| 89 | unsigned size, index, duration, chunk; | ||
| 90 | int64_t pos; | ||
| 91 | int sequence, ret, i; | ||
| 92 | |||
| 93 | ✗ | pos = avio_tell(s->pb); | |
| 94 | ✗ | if (avio_feof(s->pb)) | |
| 95 | ✗ | return AVERROR_EOF; | |
| 96 | ✗ | chunk = avio_rl32(s->pb); | |
| 97 | ✗ | size = avio_rb32(s->pb); | |
| 98 | ✗ | if (chunk == MKTAG('A','I','X','E')) { | |
| 99 | ✗ | avio_skip(s->pb, size); | |
| 100 | ✗ | for (i = 0; i < s->nb_streams; i++) { | |
| 101 | ✗ | if (avio_feof(s->pb)) | |
| 102 | ✗ | return AVERROR_EOF; | |
| 103 | ✗ | chunk = avio_rl32(s->pb); | |
| 104 | ✗ | size = avio_rb32(s->pb); | |
| 105 | ✗ | avio_skip(s->pb, size); | |
| 106 | } | ||
| 107 | ✗ | pos = avio_tell(s->pb); | |
| 108 | ✗ | chunk = avio_rl32(s->pb); | |
| 109 | ✗ | size = avio_rb32(s->pb); | |
| 110 | } | ||
| 111 | |||
| 112 | ✗ | if (chunk != MKTAG('A','I','X','P')) | |
| 113 | ✗ | return AVERROR_INVALIDDATA; | |
| 114 | ✗ | if (size <= 8) | |
| 115 | ✗ | return AVERROR_INVALIDDATA; | |
| 116 | ✗ | index = avio_r8(s->pb); | |
| 117 | ✗ | if (avio_r8(s->pb) != s->nb_streams || index >= s->nb_streams) | |
| 118 | ✗ | return AVERROR_INVALIDDATA; | |
| 119 | ✗ | duration = avio_rb16(s->pb); | |
| 120 | ✗ | sequence = avio_rb32(s->pb); | |
| 121 | ✗ | if (sequence < 0) { | |
| 122 | ✗ | avio_skip(s->pb, size - 8); | |
| 123 | ✗ | return 0; | |
| 124 | } | ||
| 125 | |||
| 126 | ✗ | ret = av_get_packet(s->pb, pkt, size - 8); | |
| 127 | ✗ | pkt->stream_index = index; | |
| 128 | ✗ | pkt->duration = duration; | |
| 129 | ✗ | pkt->pos = pos; | |
| 130 | ✗ | return ret; | |
| 131 | } | ||
| 132 | |||
| 133 | const FFInputFormat ff_aix_demuxer = { | ||
| 134 | .p.name = "aix", | ||
| 135 | .p.long_name = NULL_IF_CONFIG_SMALL("CRI AIX"), | ||
| 136 | .p.extensions= "aix", | ||
| 137 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 138 | .read_probe = aix_probe, | ||
| 139 | .read_header = aix_read_header, | ||
| 140 | .read_packet = aix_read_packet, | ||
| 141 | }; | ||
| 142 |