| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RedSpark demuxer | ||
| 3 | * Copyright (c) 2013 James Almer | ||
| 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 "libavcodec/bytestream.h" | ||
| 23 | #include "libavutil/intreadwrite.h" | ||
| 24 | #include "avformat.h" | ||
| 25 | #include "avio.h" | ||
| 26 | #include "demux.h" | ||
| 27 | #include "internal.h" | ||
| 28 | |||
| 29 | #define HEADER_SIZE 4096 | ||
| 30 | #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) | ||
| 31 | |||
| 32 | typedef struct RedSparkContext { | ||
| 33 | int samples_count; | ||
| 34 | } RedSparkContext; | ||
| 35 | |||
| 36 | 7252 | static int redspark_probe(const AVProbeData *p) | |
| 37 | { | ||
| 38 | uint32_t key, data; | ||
| 39 | uint8_t header[8]; | ||
| 40 | |||
| 41 | /* Decrypt first 8 bytes of the header */ | ||
| 42 | 7252 | data = AV_RB32(p->buf); | |
| 43 | 7252 | key = data ^ 0x52656453; | |
| 44 | 7252 | data ^= key; | |
| 45 | 7252 | AV_WB32(header, data); | |
| 46 | 7252 | key = rol(key, 11); | |
| 47 | |||
| 48 | 7252 | key += rol(key, 3); | |
| 49 | 7252 | data = AV_RB32(p->buf + 4) ^ key; | |
| 50 | 7252 | AV_WB32(header + 4, data); | |
| 51 | |||
| 52 |
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7252 | if (AV_RB64(header) == AV_RB64("RedSpark")) |
| 53 | 1 | return AVPROBE_SCORE_MAX; | |
| 54 | |||
| 55 | 7251 | return 0; | |
| 56 | } | ||
| 57 | |||
| 58 | 1 | static int redspark_read_header(AVFormatContext *s) | |
| 59 | { | ||
| 60 | 1 | AVIOContext *pb = s->pb; | |
| 61 | 1 | RedSparkContext *redspark = s->priv_data; | |
| 62 | AVCodecParameters *par; | ||
| 63 | GetByteContext gbc; | ||
| 64 | 1 | int i, coef_off, ret = 0; | |
| 65 | uint32_t key, data; | ||
| 66 | uint8_t header[HEADER_SIZE]; | ||
| 67 | AVStream *st; | ||
| 68 | |||
| 69 | 1 | st = avformat_new_stream(s, NULL); | |
| 70 |
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1 | if (!st) |
| 71 | ✗ | return AVERROR(ENOMEM); | |
| 72 | 1 | par = st->codecpar; | |
| 73 | |||
| 74 | /* Decrypt header */ | ||
| 75 | 1 | data = avio_rb32(pb); | |
| 76 | 1 | key = data ^ 0x52656453; | |
| 77 | 1 | data ^= key; | |
| 78 | 1 | AV_WB32(header, data); | |
| 79 | 1 | key = rol(key, 11); | |
| 80 | |||
| 81 |
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1024 | for (i = 4; i < HEADER_SIZE; i += 4) { |
| 82 | 1023 | key += rol(key, 3); | |
| 83 | 1023 | data = avio_rb32(pb) ^ key; | |
| 84 | 1023 | AV_WB32(header + i, data); | |
| 85 | } | ||
| 86 | |||
| 87 | 1 | par->codec_id = AV_CODEC_ID_ADPCM_THP; | |
| 88 | 1 | par->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 89 | |||
| 90 | 1 | bytestream2_init(&gbc, header, HEADER_SIZE); | |
| 91 | 1 | bytestream2_seek(&gbc, 0x3c, SEEK_SET); | |
| 92 | 1 | par->sample_rate = bytestream2_get_be32u(&gbc); | |
| 93 |
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1 | if (par->sample_rate <= 0 || par->sample_rate > 96000) { |
| 94 | ✗ | av_log(s, AV_LOG_ERROR, "Invalid sample rate: %d\n", par->sample_rate); | |
| 95 | ✗ | return AVERROR_INVALIDDATA; | |
| 96 | } | ||
| 97 | |||
| 98 | 1 | st->duration = bytestream2_get_be32u(&gbc) * 14; | |
| 99 | 1 | redspark->samples_count = 0; | |
| 100 | 1 | bytestream2_skipu(&gbc, 10); | |
| 101 | 1 | par->ch_layout.nb_channels = bytestream2_get_byteu(&gbc); | |
| 102 |
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1 | if (!par->ch_layout.nb_channels) { |
| 103 | ✗ | return AVERROR_INVALIDDATA; | |
| 104 | } | ||
| 105 | |||
| 106 | 1 | coef_off = 0x54 + par->ch_layout.nb_channels * 8; | |
| 107 |
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1 | if (bytestream2_get_byteu(&gbc)) // Loop flag |
| 108 | ✗ | coef_off += 16; | |
| 109 | |||
| 110 |
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1 | if (coef_off + par->ch_layout.nb_channels * (32 + 14) > HEADER_SIZE) { |
| 111 | ✗ | return AVERROR_INVALIDDATA; | |
| 112 | } | ||
| 113 | |||
| 114 |
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1 | if (ff_alloc_extradata(par, 32 * par->ch_layout.nb_channels)) { |
| 115 | ✗ | return AVERROR_INVALIDDATA; | |
| 116 | } | ||
| 117 | |||
| 118 | /* Get the ADPCM table */ | ||
| 119 | 1 | bytestream2_seek(&gbc, coef_off, SEEK_SET); | |
| 120 |
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3 | for (i = 0; i < par->ch_layout.nb_channels; i++) { |
| 121 |
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2 | if (bytestream2_get_bufferu(&gbc, par->extradata + i * 32, 32) != 32) { |
| 122 | ✗ | return AVERROR_INVALIDDATA; | |
| 123 | } | ||
| 124 | 2 | bytestream2_skipu(&gbc, 14); | |
| 125 | } | ||
| 126 | |||
| 127 | 1 | avpriv_set_pts_info(st, 64, 1, par->sample_rate); | |
| 128 | |||
| 129 | 1 | return ret; | |
| 130 | } | ||
| 131 | |||
| 132 | 1761 | static int redspark_read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 133 | { | ||
| 134 | 1761 | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 135 | 1761 | RedSparkContext *redspark = s->priv_data; | |
| 136 | 1761 | uint32_t size = 8 * par->ch_layout.nb_channels; | |
| 137 | int ret; | ||
| 138 | |||
| 139 |
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1761 | if (avio_feof(s->pb) || redspark->samples_count == s->streams[0]->duration) |
| 140 | ✗ | return AVERROR_EOF; | |
| 141 | |||
| 142 | 1761 | ret = av_get_packet(s->pb, pkt, size); | |
| 143 |
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1761 | if (ret != size) { |
| 144 | 1 | return AVERROR(EIO); | |
| 145 | } | ||
| 146 | |||
| 147 | 1760 | pkt->duration = 14; | |
| 148 | 1760 | redspark->samples_count += pkt->duration; | |
| 149 | 1760 | pkt->stream_index = 0; | |
| 150 | |||
| 151 | 1760 | return ret; | |
| 152 | } | ||
| 153 | |||
| 154 | const FFInputFormat ff_redspark_demuxer = { | ||
| 155 | .p.name = "redspark", | ||
| 156 | .p.long_name = NULL_IF_CONFIG_SMALL("RedSpark"), | ||
| 157 | .p.extensions = "rsd", | ||
| 158 | .priv_data_size = sizeof(RedSparkContext), | ||
| 159 | .read_probe = redspark_probe, | ||
| 160 | .read_header = redspark_read_header, | ||
| 161 | .read_packet = redspark_read_packet, | ||
| 162 | }; | ||
| 163 |