| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * AST demuxer | ||
| 3 | * Copyright (c) 2012 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/channel_layout.h" | ||
| 23 | #include "libavutil/intreadwrite.h" | ||
| 24 | #include "avformat.h" | ||
| 25 | #include "demux.h" | ||
| 26 | #include "internal.h" | ||
| 27 | #include "ast.h" | ||
| 28 | |||
| 29 | 7125 | static int ast_probe(const AVProbeData *p) | |
| 30 | { | ||
| 31 |
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7125 | if (AV_RL32(p->buf) != MKTAG('S','T','R','M')) |
| 32 | 7122 | return 0; | |
| 33 | |||
| 34 |
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3 | if (!AV_RB16(p->buf + 10) || |
| 35 |
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3 | !AV_RB16(p->buf + 12) || AV_RB16(p->buf + 12) > 256 || |
| 36 |
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3 | !AV_RB32(p->buf + 16) || AV_RB32(p->buf + 16) > 8*48000) |
| 37 | ✗ | return AVPROBE_SCORE_MAX / 8; | |
| 38 | |||
| 39 | 3 | return AVPROBE_SCORE_MAX / 3 * 2; | |
| 40 | } | ||
| 41 | |||
| 42 | 3 | static int ast_read_header(AVFormatContext *s) | |
| 43 | { | ||
| 44 | int depth; | ||
| 45 | AVStream *st; | ||
| 46 | |||
| 47 | 3 | st = avformat_new_stream(s, NULL); | |
| 48 |
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3 | if (!st) |
| 49 | ✗ | return AVERROR(ENOMEM); | |
| 50 | |||
| 51 | 3 | avio_skip(s->pb, 8); | |
| 52 | 3 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 53 | 3 | st->codecpar->codec_id = ff_codec_get_id(ff_codec_ast_tags, avio_rb16(s->pb)); | |
| 54 | |||
| 55 | 3 | depth = avio_rb16(s->pb); | |
| 56 |
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3 | if (depth != 16) { |
| 57 | ✗ | avpriv_request_sample(s, "depth %d", depth); | |
| 58 | ✗ | return AVERROR_INVALIDDATA; | |
| 59 | } | ||
| 60 | |||
| 61 | 3 | st->codecpar->ch_layout.nb_channels = avio_rb16(s->pb); | |
| 62 |
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3 | if (!st->codecpar->ch_layout.nb_channels) |
| 63 | ✗ | return AVERROR_INVALIDDATA; | |
| 64 | |||
| 65 |
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3 | if (st->codecpar->ch_layout.nb_channels == 2) |
| 66 | 3 | st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; | |
| 67 | ✗ | else if (st->codecpar->ch_layout.nb_channels == 4) | |
| 68 | ✗ | st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_4POINT0; | |
| 69 | |||
| 70 | 3 | avio_skip(s->pb, 2); | |
| 71 | 3 | st->codecpar->sample_rate = avio_rb32(s->pb); | |
| 72 |
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3 | if (st->codecpar->sample_rate <= 0) |
| 73 | ✗ | return AVERROR_INVALIDDATA; | |
| 74 | 3 | st->start_time = 0; | |
| 75 | 3 | st->duration = avio_rb32(s->pb); | |
| 76 | 3 | avio_skip(s->pb, 40); | |
| 77 | 3 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
| 78 | |||
| 79 | 3 | return 0; | |
| 80 | } | ||
| 81 | |||
| 82 | 41 | static int ast_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 83 | { | ||
| 84 | uint32_t type, size; | ||
| 85 | int64_t pos; | ||
| 86 | int ret; | ||
| 87 | |||
| 88 |
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41 | if (avio_feof(s->pb)) |
| 89 | 3 | return AVERROR_EOF; | |
| 90 | |||
| 91 | 38 | pos = avio_tell(s->pb); | |
| 92 | 38 | type = avio_rl32(s->pb); | |
| 93 | 38 | size = avio_rb32(s->pb); | |
| 94 |
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38 | if (!s->streams[0]->codecpar->ch_layout.nb_channels || |
| 95 |
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38 | size > INT_MAX / s->streams[0]->codecpar->ch_layout.nb_channels) |
| 96 | ✗ | return AVERROR_INVALIDDATA; | |
| 97 | |||
| 98 | 38 | size *= s->streams[0]->codecpar->ch_layout.nb_channels; | |
| 99 |
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38 | if ((ret = avio_skip(s->pb, 24)) < 0) // padding |
| 100 | 3 | return ret; | |
| 101 | |||
| 102 |
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35 | if (type == MKTAG('B','L','C','K')) { |
| 103 | 35 | ret = av_get_packet(s->pb, pkt, size); | |
| 104 | 35 | pkt->stream_index = 0; | |
| 105 | 35 | pkt->pos = pos; | |
| 106 | } else { | ||
| 107 | ✗ | av_log(s, AV_LOG_ERROR, "unknown chunk %"PRIx32"\n", type); | |
| 108 | ✗ | avio_skip(s->pb, size); | |
| 109 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 110 | } | ||
| 111 | |||
| 112 | 35 | return ret; | |
| 113 | } | ||
| 114 | |||
| 115 | const FFInputFormat ff_ast_demuxer = { | ||
| 116 | .p.name = "ast", | ||
| 117 | .p.long_name = NULL_IF_CONFIG_SMALL("AST (Audio Stream)"), | ||
| 118 | .p.extensions = "ast", | ||
| 119 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 120 | .p.codec_tag = ff_ast_codec_tags_list, | ||
| 121 | .read_probe = ast_probe, | ||
| 122 | .read_header = ast_read_header, | ||
| 123 | .read_packet = ast_read_packet, | ||
| 124 | }; | ||
| 125 |