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| | 1 | /* |
| | 2 | * WavArc demuxer |
| | 3 | * Copyright (c) 2023 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 "rawdec.h" |
| | 28 | |
| | 29 | static int wavarc_probe(const AVProbeData *p) |
| | 30 | { |
| | 31 | int len = p->buf[0]; |
| | 32 | uint32_t id; |
| | 33 | |
| | 34 | if (len == 0 || len + 6 >= p->buf_size) |
| | 35 | return 0; |
| | 36 | |
| | 37 | if (p->buf[len + 1] != 0) |
| | 38 | return 0; |
| | 39 | |
| | 40 | id = AV_RL32(p->buf + len + 2); |
| | 41 | if (id != MKTAG('1','D','I','F') && |
| | 42 | id != MKTAG('2','S','L','P') && |
| | 43 | id != MKTAG('3','N','L','P') && |
| | 44 | id != MKTAG('4','A','L','P') && |
| | 45 | id != MKTAG('5','E','L','P')) |
| | 46 | return 0; |
| | 47 | |
| | 48 | return AVPROBE_SCORE_MAX / 3 * 2; |
| | 49 | } |
| | 50 | |
| | 51 | static int wavarc_read_header(AVFormatContext *s) |
| | 52 | { |
| | 53 | AVIOContext *pb = s->pb; |
| | 54 | AVCodecParameters *par; |
| | 55 | int filename_len, fmt_len, ret; |
| | 56 | uint8_t data[36]; |
| | 57 | AVStream *st; |
| | 58 | uint32_t id; |
| | 59 | |
| | 60 | filename_len = avio_r8(pb); |
| | 61 | if (filename_len == 0) |
| | 62 | return AVERROR_INVALIDDATA; |
| | 63 | avio_skip(pb, filename_len); |
| | 64 | if (avio_r8(pb)) |
| | 65 | return AVERROR_INVALIDDATA; |
| | 66 | id = avio_rl32(pb); |
| | 67 | if (avio_read(pb, data, sizeof(data)) != sizeof(data)) |
| | 68 | return AVERROR(EIO); |
| | 69 | fmt_len = AV_RL32(data + 32); |
| | 70 | if (fmt_len < 12) |
| | 71 | return AVERROR_INVALIDDATA; |
| | 72 | |
| | 73 | st = avformat_new_stream(s, NULL); |
| | 74 | if (!st) |
| | 75 | return AVERROR(ENOMEM); |
| | 76 | par = st->codecpar; |
| | 77 | |
| | 78 | ret = ff_alloc_extradata(par, fmt_len + sizeof(data)); |
| | 79 | if (ret < 0) |
| | 80 | return ret; |
| | 81 | memcpy(par->extradata, data, sizeof(data)); |
| | 82 | avio_read(pb, par->extradata + sizeof(data), fmt_len); |
| | 83 | |
| | 84 | par->codec_type = AVMEDIA_TYPE_AUDIO; |
| | 85 | par->codec_id = AV_CODEC_ID_WAVARC; |
| | 86 | par->codec_tag = id; |
| | 87 | |
| | 88 | do { |
| | 89 | id = avio_rl32(pb); |
| | 90 | if (id != MKTAG('d','a','t','a')) |
| | 91 | avio_skip(pb, avio_rl32(pb)); |
| | 92 | } while (id != MKTAG('d','a','t','a')); |
| | 93 | avio_skip(pb, 4); |
| | 94 | |
| | 95 | if (AV_RL32(par->extradata + 16) != MKTAG('R','I','F','F')) |
| | 96 | return AVERROR_INVALIDDATA; |
| | 97 | if (AV_RL32(par->extradata + 24) != MKTAG('W','A','V','E')) |
| | 98 | return AVERROR_INVALIDDATA; |
| | 99 | if (AV_RL32(par->extradata + 28) != MKTAG('f','m','t',' ')) |
| | 100 | return AVERROR_INVALIDDATA; |
| | 101 | |
| | 102 | av_channel_layout_default(&par->ch_layout, AV_RL16(par->extradata + 38)); |
| | 103 | par->sample_rate = AV_RL32(par->extradata + 40); |
| | 104 | avpriv_set_pts_info(st, 64, 1, par->sample_rate); |
| | 105 | st->start_time = 0; |
| | 106 | |
| | 107 | switch (par->extradata[36]) { |
| | 108 | case 0: par->format = AV_SAMPLE_FMT_U8P; break; |
| | 109 | case 1: par->format = AV_SAMPLE_FMT_S16P; break; |
| | 110 | } |
| | 111 | |
| | 112 | return 0; |
| | 113 | } |
| | 114 | |
| | 115 | const AVInputFormat ff_wavarc_demuxer = { |
| | 116 | .name = "wavarc", |
| | 117 | .long_name = NULL_IF_CONFIG_SMALL("Waveform Archiver"), |
| | 118 | .read_probe = wavarc_probe, |
| | 119 | .read_packet = ff_raw_read_partial_packet, |
| | 120 | .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS, |
| | 121 | .read_header = wavarc_read_header, |
| | 122 | .extensions = "wa", |
| | 123 | .raw_codec_id = AV_CODEC_ID_WAVARC, |
| | 124 | .priv_data_size = sizeof(FFRawDemuxerContext), |
| | 125 | .priv_class = &ff_raw_demuxer_class, |
| | 126 | }; |