scuffle_ffmpeg/
codec.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
use ffmpeg_sys_next::*;

#[derive(Clone, Copy, PartialEq, Eq)]
pub struct DecoderCodec(*const AVCodec);

impl std::fmt::Debug for DecoderCodec {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		if self.0.is_null() {
			return f
				.debug_struct("DecoderCodec")
				.field("name", &c"null")
				.field("id", &AVCodecID::AV_CODEC_ID_NONE)
				.finish();
		}

		// Safety: `self.0` is a non-null pointer.
		let name = unsafe { std::ffi::CStr::from_ptr((*self.0).name) };
		f.debug_struct("DecoderCodec")
			.field("name", &name)
			// Safety: `self.0` is a non-null pointer.
			.field("id", unsafe { &(*self.0).id })
			.finish()
	}
}

impl DecoderCodec {
	pub fn empty() -> Self {
		Self(std::ptr::null())
	}

	pub fn new(codec_id: AVCodecID) -> Option<Self> {
		// Safety: `avcodec_find_decoder` is safe to call.
		let codec = unsafe { avcodec_find_decoder(codec_id) };
		if codec.is_null() {
			None
		} else {
			Some(Self(codec))
		}
	}

	pub fn by_name(name: &str) -> Option<Self> {
		let c_name = std::ffi::CString::new(name).ok()?;

		// Safety: `avcodec_find_decoder_by_name` is safe to call with a valid c-string.
		let codec = unsafe { avcodec_find_decoder_by_name(c_name.as_ptr()) };
		if codec.is_null() {
			None
		} else {
			Some(Self(codec))
		}
	}

	pub fn as_ptr(&self) -> *const AVCodec {
		self.0
	}

	pub fn from_ptr(ptr: *const AVCodec) -> Self {
		Self(ptr)
	}
}

#[derive(Clone, Copy, PartialEq, Eq)]
pub struct EncoderCodec(*const AVCodec);

impl std::fmt::Debug for EncoderCodec {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		if self.0.is_null() {
			return f
				.debug_struct("EncoderCodec")
				.field("name", &c"null")
				.field("id", &AVCodecID::AV_CODEC_ID_NONE)
				.finish();
		}

		// Safety: `self.0` is a valid pointer.
		let name = unsafe { std::ffi::CStr::from_ptr((*self.0).name) };
		f.debug_struct("EncoderCodec")
			.field("name", &name)
			// Safety: `self.0` is a valid pointer.
			.field("id", unsafe { &(*self.0).id })
			.finish()
	}
}

impl EncoderCodec {
	pub fn empty() -> Self {
		Self(std::ptr::null())
	}

	pub fn new(codec_id: AVCodecID) -> Option<Self> {
		// Safety: `avcodec_find_encoder` is safe to call.
		let codec = unsafe { avcodec_find_encoder(codec_id) };
		if codec.is_null() {
			None
		} else {
			Some(Self(codec))
		}
	}

	pub fn by_name(name: &str) -> Option<Self> {
		let c_name = std::ffi::CString::new(name).ok()?;
		// Safety: `avcodec_find_encoder_by_name` is safe to call with a valid c-string.
		let codec = unsafe { avcodec_find_encoder_by_name(c_name.as_ptr()) };
		if codec.is_null() {
			None
		} else {
			Some(Self(codec))
		}
	}

	pub fn as_ptr(&self) -> *const AVCodec {
		self.0
	}

	pub fn from_ptr(ptr: *const AVCodec) -> Self {
		Self(ptr)
	}
}

impl From<EncoderCodec> for *const AVCodec {
	fn from(codec: EncoderCodec) -> Self {
		codec.0
	}
}

impl From<DecoderCodec> for *const AVCodec {
	fn from(codec: DecoderCodec) -> Self {
		codec.0
	}
}