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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
|
//! Decoding of AVIF images.
///
/// The [AVIF] specification defines an image derivative of the AV1 bitstream, an open video codec.
///
/// [AVIF]: https://aomediacodec.github.io/av1-avif/
use std::convert::TryFrom;
use std::error::Error;
use std::io::{self, Cursor, Read};
use std::marker::PhantomData;
use std::mem;
use crate::error::DecodingError;
use crate::{ColorType, ImageDecoder, ImageError, ImageFormat, ImageResult};
use dav1d::{PixelLayout, PlanarImageComponent};
use dcv_color_primitives as dcp;
use mp4parse::{read_avif, ParseStrictness};
fn error_map<E: Into<Box<dyn Error + Send + Sync>>>(err: E) -> ImageError {
ImageError::Decoding(DecodingError::new(ImageFormat::Avif.into(), err))
}
/// AVIF Decoder.
///
/// Reads one image into the chosen input.
pub struct AvifDecoder<R> {
inner: PhantomData<R>,
picture: dav1d::Picture,
alpha_picture: Option<dav1d::Picture>,
icc_profile: Option<Vec<u8>>,
}
impl<R: Read> AvifDecoder<R> {
/// Create a new decoder that reads its input from `r`.
pub fn new(mut r: R) -> ImageResult<Self> {
let ctx = read_avif(&mut r, ParseStrictness::Normal).map_err(error_map)?;
let coded = ctx.primary_item_coded_data().unwrap_or_default();
let mut primary_decoder = dav1d::Decoder::new();
primary_decoder
.send_data(coded, None, None, None)
.map_err(error_map)?;
let picture = primary_decoder.get_picture().map_err(error_map)?;
let alpha_item = ctx.alpha_item_coded_data().unwrap_or_default();
let alpha_picture = if !alpha_item.is_empty() {
let mut alpha_decoder = dav1d::Decoder::new();
alpha_decoder
.send_data(alpha_item, None, None, None)
.map_err(error_map)?;
Some(alpha_decoder.get_picture().map_err(error_map)?)
} else {
None
};
let icc_profile = ctx
.icc_colour_information()
.map(|x| x.ok().unwrap_or_default())
.map(|x| x.to_vec());
assert_eq!(picture.bit_depth(), 8);
Ok(AvifDecoder {
inner: PhantomData,
picture,
alpha_picture,
icc_profile,
})
}
}
/// Wrapper struct around a `Cursor<Vec<u8>>`
pub struct AvifReader<R>(Cursor<Vec<u8>>, PhantomData<R>);
impl<R> Read for AvifReader<R> {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.0.read(buf)
}
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
if self.0.position() == 0 && buf.is_empty() {
mem::swap(buf, self.0.get_mut());
Ok(buf.len())
} else {
self.0.read_to_end(buf)
}
}
}
impl<'a, R: 'a + Read> ImageDecoder<'a> for AvifDecoder<R> {
type Reader = AvifReader<R>;
fn dimensions(&self) -> (u32, u32) {
(self.picture.width(), self.picture.height())
}
fn color_type(&self) -> ColorType {
ColorType::Rgba8
}
fn icc_profile(&mut self) -> Option<Vec<u8>> {
self.icc_profile.clone()
}
fn into_reader(self) -> ImageResult<Self::Reader> {
let plane = self.picture.plane(PlanarImageComponent::Y);
Ok(AvifReader(
Cursor::new(plane.as_ref().to_vec()),
PhantomData,
))
}
fn read_image(self, buf: &mut [u8]) -> ImageResult<()> {
assert_eq!(u64::try_from(buf.len()), Ok(self.total_bytes()));
dcp::initialize();
if self.picture.pixel_layout() != PixelLayout::I400 {
let pixel_format = match self.picture.pixel_layout() {
PixelLayout::I400 => todo!(),
PixelLayout::I420 => dcp::PixelFormat::I420,
PixelLayout::I422 => dcp::PixelFormat::I422,
PixelLayout::I444 => dcp::PixelFormat::I444,
PixelLayout::Unknown => panic!("Unknown pixel layout"),
};
let src_format = dcp::ImageFormat {
pixel_format,
color_space: dcp::ColorSpace::Bt601,
num_planes: 3,
};
let dst_format = dcp::ImageFormat {
pixel_format: dcp::PixelFormat::Rgba,
color_space: dcp::ColorSpace::Lrgb,
num_planes: 1,
};
let (width, height) = self.dimensions();
let planes = &[
self.picture.plane(PlanarImageComponent::Y),
self.picture.plane(PlanarImageComponent::U),
self.picture.plane(PlanarImageComponent::V),
];
let src_buffers = planes.iter().map(AsRef::as_ref).collect::<Vec<_>>();
let strides = &[
self.picture.stride(PlanarImageComponent::Y) as usize,
self.picture.stride(PlanarImageComponent::U) as usize,
self.picture.stride(PlanarImageComponent::V) as usize,
];
let dst_buffers = &mut [&mut buf[..]];
dcp::convert_image(
width,
height,
&src_format,
Some(strides),
&src_buffers,
&dst_format,
None,
dst_buffers,
)
.map_err(error_map)?;
} else {
let plane = self.picture.plane(PlanarImageComponent::Y);
buf.copy_from_slice(plane.as_ref());
}
if let Some(picture) = self.alpha_picture {
assert_eq!(picture.pixel_layout(), PixelLayout::I400);
let stride = picture.stride(PlanarImageComponent::Y) as usize;
let plane = picture.plane(PlanarImageComponent::Y);
let width = picture.width();
for (buf, slice) in Iterator::zip(
buf.chunks_exact_mut(width as usize * 4),
plane.as_ref().chunks_exact(stride),
) {
for i in 0..width as usize {
buf[3 + i * 4] = slice[i];
}
}
}
Ok(())
}
}
|
