infer/matchers/
audio.rs

1/// Returns whether a buffer is MIDI data.
2pub fn is_midi(buf: &[u8]) -> bool {
3    buf.len() > 3 && buf[0] == 0x4D && buf[1] == 0x54 && buf[2] == 0x68 && buf[3] == 0x64
4}
5
6/// Returns whether a buffer is MP3 data.
7pub fn is_mp3(buf: &[u8]) -> bool {
8    buf.len() > 2
9        && ((buf[0] == 0x49 && buf[1] == 0x44 && buf[2] == 0x33) // ID3v2
10			// Final bit (has crc32) may be or may not be set.
11			|| (buf[0] == 0xFF && buf[1] == 0xFB))
12}
13
14/// Returns whether a buffer is M4A data.
15pub fn is_m4a(buf: &[u8]) -> bool {
16    buf.len() > 10
17        && ((buf[4] == 0x66
18            && buf[5] == 0x74
19            && buf[6] == 0x79
20            && buf[7] == 0x70
21            && buf[8] == 0x4D
22            && buf[9] == 0x34
23            && buf[10] == 0x41)
24            || (buf[0] == 0x4D && buf[1] == 0x34 && buf[2] == 0x41 && buf[3] == 0x20))
25}
26
27/// Returns whether a buffer is OGG data.
28pub fn is_ogg(buf: &[u8]) -> bool {
29    buf.len() > 3 && buf[0] == 0x4F && buf[1] == 0x67 && buf[2] == 0x67 && buf[3] == 0x53
30}
31
32/// Returns whether a buffer is FLAC data.
33pub fn is_flac(buf: &[u8]) -> bool {
34    buf.len() > 3 && buf[0] == 0x66 && buf[1] == 0x4C && buf[2] == 0x61 && buf[3] == 0x43
35}
36
37/// Returns whether a buffer is WAV data.
38pub fn is_wav(buf: &[u8]) -> bool {
39    buf.len() > 11
40        && buf[0] == 0x52
41        && buf[1] == 0x49
42        && buf[2] == 0x46
43        && buf[3] == 0x46
44        && buf[8] == 0x57
45        && buf[9] == 0x41
46        && buf[10] == 0x56
47        && buf[11] == 0x45
48}
49
50/// Returns whether a buffer is AMR data.
51pub fn is_amr(buf: &[u8]) -> bool {
52    buf.len() > 11
53        && buf[0] == 0x23
54        && buf[1] == 0x21
55        && buf[2] == 0x41
56        && buf[3] == 0x4D
57        && buf[4] == 0x52
58        && buf[5] == 0x0A
59}
60
61/// Returns whether a buffer is AAC data.
62pub fn is_aac(buf: &[u8]) -> bool {
63    buf.len() > 1 && buf[0] == 0xFF && (buf[1] == 0xF1 || buf[1] == 0xF9)
64}