nannou_video 0.20.0

Video decoding and playback, built on Bevy for nannou - the creative-coding framework.
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

use bevy::asset::RenderAssetUsages;
use bevy::prelude::*;
use bevy::render::render_resource::{Extent3d, TextureDimension, TextureFormat};

use crate::asset::Video;
use crate::components::{SeekTo, VideoOutput, VideoPlayer};
use crate::events::{VideoEnded, VideoFailed, VideoLoaded, VideoLooped, VideoSeeked};
use crate::worker::{
    FrameEvent, FramePayload, PlayerCommand, VideoWorker, WorkerConfig, spawn_worker,
};

#[derive(Component)]
pub(crate) struct PendingVideo;

pub(crate) fn attach_workers(
    mut commands: Commands,
    mut images: ResMut<Assets<Image>>,
    videos: Res<Assets<Video>>,
    added: Query<(Entity, &VideoPlayer), (Added<VideoPlayer>, Without<VideoWorker>)>,
    pending: Query<(Entity, &VideoPlayer), (With<PendingVideo>, Without<VideoWorker>)>,
) {
    for (entity, player) in added.iter().chain(pending.iter()) {
        let Some(video) = videos.get(&player.video) else {
            commands.entity(entity).insert(PendingVideo);
            continue;
        };
        let image = Image::new_fill(
            Extent3d {
                width: video.size.x,
                height: video.size.y,
                ..default()
            },
            TextureDimension::D2,
            &[0, 0, 0, 255],
            TextureFormat::Rgba8UnormSrgb,
            RenderAssetUsages::default(),
        );
        let image_handle = images.add(image);
        let worker = spawn_worker(WorkerConfig {
            source: video.source.clone(),
            mode: player.mode,
            hw_accel: player.hw_accel.resolve(),
            resize: player.resize.resolve(),
            options: video.options.clone(),
        });
        if player.paused {
            let _ = worker.cmd_tx.send(PlayerCommand::Pause);
        }
        if (player.speed - 1.0).abs() > f32::EPSILON {
            let _ = worker.cmd_tx.send(PlayerCommand::SetSpeed(player.speed));
        }
        commands.entity(entity).insert((
            VideoOutput {
                image: image_handle,
                size: video.size,
                position_seconds: 0.0,
            },
            worker,
        ));
        commands.entity(entity).remove::<PendingVideo>();
        commands
            .entity(entity)
            .trigger(|e| VideoLoaded { entity: e });
    }
}

pub(crate) fn process_seeks(mut commands: Commands, seeks: Query<(Entity, &VideoWorker, &SeekTo)>) {
    for (entity, worker, seek) in &seeks {
        let _ = worker.cmd_tx.send(PlayerCommand::Seek(seek.0));
        commands.entity(entity).remove::<SeekTo>();
        commands.entity(entity).trigger(|e| VideoSeeked {
            entity: e,
            to_seconds: seek.0,
        });
    }
}

pub(crate) fn sync_commands(players: Query<(&VideoPlayer, &VideoWorker), Changed<VideoPlayer>>) {
    for (player, worker) in &players {
        let _ = worker.cmd_tx.send(if player.paused {
            PlayerCommand::Pause
        } else {
            PlayerCommand::Play
        });
        let _ = worker.cmd_tx.send(PlayerCommand::SetSpeed(player.speed));
        let _ = worker.cmd_tx.send(PlayerCommand::SetMode(player.mode));
    }
}

pub(crate) fn drain_frames(
    mut commands: Commands,
    mut images: ResMut<Assets<Image>>,
    mut players: Query<(Entity, &VideoWorker, &mut VideoOutput)>,
) {
    for (entity, worker, mut output) in &mut players {
        let mut latest_frame: Option<FramePayload> = None;
        while let Ok(event) = worker.frame_rx.try_recv() {
            match event {
                FrameEvent::Frame(payload) => {
                    latest_frame = Some(payload);
                }
                FrameEvent::Ended => {
                    commands
                        .entity(entity)
                        .trigger(|e| VideoEnded { entity: e });
                }
                FrameEvent::Looped => {
                    commands
                        .entity(entity)
                        .trigger(|e| VideoLooped { entity: e });
                }
                FrameEvent::Error(reason) => {
                    commands
                        .entity(entity)
                        .trigger(|e| VideoFailed { entity: e, reason });
                }
            }
        }
        if let Some(payload) = latest_frame {
            if let Some(mut image) = images.get_mut(&output.image) {
                write_frame(&mut image, payload.size, payload.pixels);
            }
            output.size = payload.size;
            output.position_seconds = payload.pts_seconds;
        }
    }
}

pub(crate) fn on_player_removed(event: On<Remove, VideoPlayer>, mut commands: Commands) {
    let entity = event.event_target();
    commands
        .entity(entity)
        .remove::<(VideoWorker, VideoOutput, PendingVideo, SeekTo)>();
}

fn write_frame(image: &mut Image, size: UVec2, pixels: Vec<u8>) {
    let extent = Extent3d {
        width: size.x,
        height: size.y,
        depth_or_array_layers: 1,
    };
    if image.texture_descriptor.size != extent {
        image.resize(extent);
    }
    image.data = Some(pixels);
}