| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * ACE demuxer | ||
| 3 | * Copyright (c) 2020 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 ace_probe(const AVProbeData *p) | |
| 28 | { | ||
| 29 | uint32_t asc; | ||
| 30 | |||
| 31 |
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7186 | if (AV_RB32(p->buf) != MKBETAG('A','A','C',' ')) |
| 32 | 7186 | return 0; | |
| 33 | ✗ | if (p->buf_size < 0x44) | |
| 34 | ✗ | return 0; | |
| 35 | ✗ | asc = AV_RB32(p->buf + 0x40); | |
| 36 | ✗ | if (asc < 0x44 || asc > p->buf_size - 4) | |
| 37 | ✗ | return 0; | |
| 38 | ✗ | if (AV_RB32(p->buf + asc) != MKBETAG('A','S','C',' ')) | |
| 39 | ✗ | return 0; | |
| 40 | |||
| 41 | ✗ | return AVPROBE_SCORE_MAX / 2 + 1; | |
| 42 | } | ||
| 43 | |||
| 44 | ✗ | static int ace_read_header(AVFormatContext *s) | |
| 45 | { | ||
| 46 | ✗ | AVIOContext *pb = s->pb; | |
| 47 | AVCodecParameters *par; | ||
| 48 | int ret, codec, rate, nb_channels; | ||
| 49 | uint32_t asc_pos, size; | ||
| 50 | AVStream *st; | ||
| 51 | |||
| 52 | ✗ | avio_skip(pb, 0x40); | |
| 53 | ✗ | asc_pos = avio_rb32(pb); | |
| 54 | ✗ | if (asc_pos < 0x44) | |
| 55 | ✗ | return AVERROR_INVALIDDATA; | |
| 56 | ✗ | avio_skip(pb, asc_pos - 0x44); | |
| 57 | ✗ | if (avio_rb32(pb) != MKBETAG('A','S','C',' ')) | |
| 58 | ✗ | return AVERROR_INVALIDDATA; | |
| 59 | ✗ | avio_skip(pb, 0xec); | |
| 60 | ✗ | codec = avio_rb32(pb); | |
| 61 | ✗ | nb_channels = avio_rb32(pb); | |
| 62 | ✗ | if (nb_channels <= 0 || nb_channels > 8) | |
| 63 | ✗ | return AVERROR_INVALIDDATA; | |
| 64 | ✗ | size = avio_rb32(pb); | |
| 65 | ✗ | if (size == 0) | |
| 66 | ✗ | return AVERROR_INVALIDDATA; | |
| 67 | ✗ | rate = avio_rb32(pb); | |
| 68 | ✗ | if (rate <= 0) | |
| 69 | ✗ | return AVERROR_INVALIDDATA; | |
| 70 | ✗ | avio_skip(pb, 16); | |
| 71 | |||
| 72 | ✗ | st = avformat_new_stream(s, NULL); | |
| 73 | ✗ | if (!st) | |
| 74 | ✗ | return AVERROR(ENOMEM); | |
| 75 | ✗ | st->start_time = 0; | |
| 76 | ✗ | par = st->codecpar; | |
| 77 | ✗ | par->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 78 | ✗ | par->ch_layout.nb_channels = nb_channels; | |
| 79 | ✗ | par->sample_rate = rate; | |
| 80 | ✗ | par->block_align = (codec == 4 ? 0x60 : codec == 5 ? 0x98 : 0xC0) * nb_channels; | |
| 81 | ✗ | st->duration = (size / par->block_align) * 1024LL; | |
| 82 | ✗ | par->codec_id = AV_CODEC_ID_ATRAC3; | |
| 83 | |||
| 84 | ✗ | ret = ff_alloc_extradata(par, 14); | |
| 85 | ✗ | if (ret < 0) | |
| 86 | ✗ | return ret; | |
| 87 | |||
| 88 | ✗ | AV_WL16(st->codecpar->extradata, 1); | |
| 89 | ✗ | AV_WL16(st->codecpar->extradata+2, 2048 * nb_channels); | |
| 90 | ✗ | AV_WL16(st->codecpar->extradata+4, 0); | |
| 91 | ✗ | AV_WL16(st->codecpar->extradata+6, codec == 4 ? 1 : 0); | |
| 92 | ✗ | AV_WL16(st->codecpar->extradata+8, codec == 4 ? 1 : 0); | |
| 93 | ✗ | AV_WL16(st->codecpar->extradata+10, 1); | |
| 94 | ✗ | AV_WL16(st->codecpar->extradata+12, 0); | |
| 95 | |||
| 96 | ✗ | avpriv_set_pts_info(st, 64, 1, par->sample_rate); | |
| 97 | |||
| 98 | ✗ | return 0; | |
| 99 | } | ||
| 100 | |||
| 101 | ✗ | static int ace_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 102 | { | ||
| 103 | ✗ | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 104 | |||
| 105 | ✗ | return av_get_packet(s->pb, pkt, par->block_align); | |
| 106 | } | ||
| 107 | |||
| 108 | const FFInputFormat ff_ace_demuxer = { | ||
| 109 | .p.name = "ace", | ||
| 110 | .p.long_name = NULL_IF_CONFIG_SMALL("tri-Ace Audio Container"), | ||
| 111 | .p.flags = AVFMT_GENERIC_INDEX, | ||
| 112 | .read_probe = ace_probe, | ||
| 113 | .read_header = ace_read_header, | ||
| 114 | .read_packet = ace_read_packet, | ||
| 115 | }; | ||
| 116 |