FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/redspark.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 61 70 87.1%
Functions: 3 3 100.0%
Branches: 18 28 64.3%
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 7186 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 7186 data = AV_RB32(p->buf);
43 7186 key = data ^ 0x52656453;
44 7186 data ^= key;
45 7186 AV_WB32(header, data);
46 7186 key = rol(key, 11);
47
48 7186 key += rol(key, 3);
49 7186 data = AV_RB32(p->buf + 4) ^ key;
50 7186 AV_WB32(header + 4, data);
51
52
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 7186 if (AV_RB64(header) == AV_RB64("RedSpark"))
53 1 return AVPROBE_SCORE_MAX;
54
55 7185 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