cros-codecs 0.0.6

Hardware-accelerated codecs for Linux
Documentation 
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

// Copyright 2022 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

//! This file contains a dummy backend whose only purpose is to let the decoder
//! run so we can test it in isolation.

use std::cell::RefCell;
use std::rc::Rc;

use crate::decoder::stateless::PoolLayer;
use crate::decoder::stateless::StatelessCodec;
use crate::decoder::stateless::StatelessDecoderBackend;
use crate::decoder::stateless::StatelessDecoderBackendPicture;
use crate::decoder::stateless::TryFormat;
use crate::decoder::DecodedHandle;
use crate::decoder::DynHandle;
use crate::decoder::FramePool;
use crate::decoder::MappableHandle;
use crate::decoder::StreamInfo;
use crate::DecodedFormat;
use crate::Resolution;

#[derive(Default)]
pub struct BackendHandle(());

impl MappableHandle for BackendHandle {
    fn read(&mut self, _: &mut [u8]) -> anyhow::Result<()> {
        Ok(())
    }

    fn image_size(&mut self) -> usize {
        1
    }
}

impl<'a> DynHandle for std::cell::RefMut<'a, BackendHandle> {
    fn dyn_mappable_handle<'b>(&'b mut self) -> anyhow::Result<Box<dyn MappableHandle + 'b>> {
        Ok(Box::<BackendHandle>::default())
    }
}

pub struct Handle {
    pub handle: Rc<RefCell<BackendHandle>>,
}

impl Clone for Handle {
    fn clone(&self) -> Self {
        Self { handle: Rc::clone(&self.handle) }
    }
}

impl DecodedHandle for Handle {
    type Descriptor = ();

    fn coded_resolution(&self) -> Resolution {
        Default::default()
    }

    fn display_resolution(&self) -> Resolution {
        Default::default()
    }

    fn timestamp(&self) -> u64 {
        0
    }

    fn dyn_picture<'a>(&'a self) -> Box<dyn DynHandle + 'a> {
        Box::new(self.handle.borrow())
    }

    fn sync(&self) -> anyhow::Result<()> {
        Ok(())
    }

    fn is_ready(&self) -> bool {
        true
    }

    fn resource(&self) -> std::cell::Ref<()> {
        std::cell::Ref::map(self.handle.borrow(), |h| &h.0)
    }
}

/// Dummy backend that can be used for any codec.
pub struct Backend {
    stream_info: StreamInfo,
}

impl Backend {
    pub(crate) fn new() -> Self {
        Self {
            stream_info: StreamInfo {
                format: DecodedFormat::I420,
                min_num_frames: 4,
                coded_resolution: Resolution::from((320, 200)),
                display_resolution: Resolution::from((320, 200)),
            },
        }
    }
}

impl FramePool for Backend {
    type Descriptor = ();

    fn coded_resolution(&self) -> Resolution {
        Resolution::from((320, 200))
    }

    fn set_coded_resolution(&mut self, _resolution: Resolution) {}

    fn add_frames(&mut self, _descriptors: Vec<Self::Descriptor>) -> Result<(), anyhow::Error> {
        Ok(())
    }

    fn num_free_frames(&self) -> usize {
        4
    }

    fn num_managed_frames(&self) -> usize {
        4
    }

    fn clear(&mut self) {}
}

impl<Codec: StatelessCodec> StatelessDecoderBackendPicture<Codec> for Backend {
    type Picture = ();
}

impl<Codec: StatelessCodec> TryFormat<Codec> for Backend {
    fn try_format(&mut self, _: &Codec::FormatInfo, _: DecodedFormat) -> anyhow::Result<()> {
        Ok(())
    }
}

impl StatelessDecoderBackend for Backend {
    type Handle = Handle;

    type FramePool = Self;

    fn stream_info(&self) -> Option<&StreamInfo> {
        Some(&self.stream_info)
    }

    fn frame_pool(&mut self, _: PoolLayer) -> Vec<&mut Self::FramePool> {
        vec![self]
    }
}