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[package]
name = "iced_video_player"
version = "0.1.0"
authors = ["jazzfool"]
edition = "2018"
[dependencies]
iced = { git = "https://github.com/hecrj/iced", features = ["image", "tokio"] }
ffmpeg-next = "4"
tokio = { version = "0.2", features = ["rt-threaded", "macros"] }

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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.

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# Iced Video Player
Composable component to play videos in Iced applications.
## Overview
Features:
- Load video files from any file path **or URL** (support for streaming over network).
- Non-blocking (off-thread) automatic buffering.
- Programmatic play/pause/jump.
- Small (around 250 lines).
Limitations (to be hopefully fixed):
- Cannot load in-memory video data.
- Audio playback is not supported.
- Buffering does not support seeking arbitrarily - you can only seek to buffered frame.
- FFmpeg is a heavy dependency and overkill (please recommend similar *cross-platform* Rust libraries).
The player **does not** come with any surrounding GUI controls, but they should be quite easy to implement should you need them;
- Play/pause/stop can just be buttons.
- Seeking can be a slider with an overlay of the thumbnail at the seek time.
Specifically, the player exposes the buffered frames as images which can be used as thumbnails.
Through the same API, you can show the user the portions of the video have been buffered.
## Example Usage
```rust
use iced_video_player::{VideoPlayerMessage, VideoPlayer};
use iced::{executor, Application, Command, Element, Subscription};
fn main() {
App::run(Default::default());
}
#[derive(Debug)]
enum Message {
VideoPlayerMessage(VideoPlayerMessage),
}
struct App {
video: VideoPlayer,
}
impl Application for App {
type Executor = executor::Default;
type Message = Message;
type Flags = ();
fn new(_flags: ()) -> (Self, Command<Message>) {
(
App {
video: VideoPlayer::new(&"my_video.mp4").unwrap(),
},
Command::none(),
)
}
fn title(&self) -> String {
String::from("Video Player")
}
fn update(&mut self, message: Message) -> Command<Message> {
match message {
Message::VideoPlayerMessage(msg) => self.video.update(msg).map(Message::VideoPlayerMessage),
}
}
fn subscription(&self) -> Subscription<Message> {
self.video.subscription().map(Message::VideoPlayerMessage)
}
fn view(&mut self) -> Element<Message> {
self.video.view()
}
}
```
## License
Licensed under either
- [Apache 2.0](https://www.apache.org/licenses/LICENSE-2.0)
- [MIT](http://opensource.org/licenses/MIT)
at your option.

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use iced::{button, executor, Application, Button, Column, Command, Element, Subscription, Text};
use iced_video_player::{VideoPlayer, VideoPlayerMessage};
fn main() {
App::run(Default::default());
}
#[derive(Clone, Debug)]
enum Message {
TogglePause,
VideoPlayerMessage(VideoPlayerMessage),
}
struct App {
video: VideoPlayer,
pause_btn: button::State,
}
impl Application for App {
type Executor = executor::Default;
type Message = Message;
type Flags = ();
fn new(_flags: ()) -> (Self, Command<Message>) {
(
App {
video: VideoPlayer::new(
&std::path::PathBuf::from(file!())
.parent()
.unwrap()
.join("test.mp4"),
)
.unwrap(),
pause_btn: Default::default(),
},
Command::none(),
)
}
fn title(&self) -> String {
String::from("Video Player")
}
fn update(&mut self, message: Message) -> Command<Message> {
match message {
Message::TogglePause => {
self.video.paused = !self.video.paused;
Command::none()
}
Message::VideoPlayerMessage(msg) => {
self.video.update(msg).map(Message::VideoPlayerMessage)
}
}
}
fn subscription(&self) -> Subscription<Message> {
self.video.subscription().map(Message::VideoPlayerMessage)
}
fn view(&mut self) -> Element<Message> {
Column::new()
.push(self.video.view())
.push(
Button::new(&mut self.pause_btn, Text::new("Toggle Pause"))
.on_press(Message::TogglePause),
)
.into()
}
}

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use ffmpeg_next as ffmpeg;
use iced::{image, time, Command, Image, Subscription};
use std::sync::{Arc, Mutex};
use std::time::Duration;
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub enum VideoPlayerMessage {
NextFrame,
BufferingComplete {
fully_buffered: bool,
packet_count: usize,
},
}
/// Video player component which can playback videos from files or URLs.
pub struct VideoPlayer {
/// When the number of remaining buffered frames goes below this number, buffering automatically begins. Default is 100.
pub buffer_threshold: usize,
/// Number of packets (not frames) to read on each buffer. Default is 1000.
pub buffer_size: usize,
/// Whether the video is paused or not.
pub paused: bool,
frame: Option<image::Handle>,
path: std::path::PathBuf,
buffered: Arc<Mutex<Vec<image::Handle>>>,
buffering: bool,
fully_buffered: bool,
current_frame: usize,
packet_count: usize,
framerate: f32,
}
impl VideoPlayer {
pub fn new<P: AsRef<std::path::Path>>(path: &P) -> Result<Self, ffmpeg::Error> {
let video_data = VideoData::new(path)?;
let framerate = video_data
.decoder
.frame_rate()
.expect("failed to get framerate");
let buffered = Vec::new();
Ok(VideoPlayer {
buffer_threshold: 100,
buffer_size: 1000,
paused: false,
frame: None,
path: path.as_ref().to_owned(),
buffered: Arc::new(Mutex::new(buffered)),
buffering: false,
fully_buffered: false,
current_frame: 0,
packet_count: 0,
framerate: framerate.0 as f32 / framerate.1 as f32,
})
}
fn buffer(&mut self) -> Command<VideoPlayerMessage> {
assert!(self.buffer_size > 0);
if !self.fully_buffered && !self.buffering {
self.buffering = true;
let path = self.path.clone();
let buffered = Arc::clone(&self.buffered);
let buffer_size = self.buffer_size;
let prev_packet_count = self.packet_count;
Command::perform(
tokio::spawn(async move {
let mut video_data =
VideoData::new(&path).expect("failed to initialize decoder");
let mut packet_count = 0;
for (stream, packet) in video_data.ictx.packets().skip(prev_packet_count) {
if packet_count >= buffer_size {
return (false, prev_packet_count + packet_count - 1);
}
if stream.index() == video_data.video_stream_index {
video_data.decoder.send_packet(&packet).unwrap();
let mut decoded = ffmpeg::util::frame::Video::empty();
while video_data.decoder.receive_frame(&mut decoded).is_ok() {
let mut rgb = ffmpeg::util::frame::Video::empty();
video_data
.scaler
.run(&decoded, &mut rgb)
.expect("failed to convert frame color space");
buffered
.lock()
.expect("failed to unlock buffered frames for buffering")
.push(image::Handle::from_pixels(
rgb.width(),
rgb.height(),
rgb.data(0).to_owned(),
));
}
}
packet_count += 1;
}
(true, prev_packet_count + packet_count - 1)
}),
|o| {
let (fully_buffered, packet_count) = o.expect("async error");
VideoPlayerMessage::BufferingComplete {
fully_buffered,
packet_count,
}
},
)
} else {
Command::none()
}
}
/// Whether buffering is currently taking place in another thread.
pub fn is_buffering(&self) -> bool {
self.buffering
}
/// Returns the number of buffered frames.
pub fn buffered_frames_len(&self) -> usize {
self.buffered
.lock()
.expect("failed to lock buffered frames")
.len()
}
/// Returns a list of all the buffered frames as Iced image handles.
///
/// This may block if buffering is occurring.
pub fn buffered_frames(&self) -> Vec<image::Handle> {
self.buffered
.lock()
.expect("failed to lock buffered frames")
.clone() // image::Handle data is stored in Arc, so this isn't heavy
}
/// Seeks to a specified frame number.
///
/// Panics if `frame >= buffered_frames_len()`
pub fn seek(&mut self, frame: usize) {
assert!(frame < self.buffered_frames_len());
self.current_frame = frame;
}
pub fn update(&mut self, message: VideoPlayerMessage) -> Command<VideoPlayerMessage> {
match message {
VideoPlayerMessage::NextFrame => {
if self.paused {
return Command::none();
}
let (next_frame, len) = {
let buffered = self
.buffered
.lock()
.expect("failed to unlock buffered frames");
(buffered.get(self.current_frame).cloned(), buffered.len())
};
if let Some(img) = next_frame {
self.frame = Some(img.clone());
if self.current_frame < len - 1 {
self.current_frame += 1;
if len - self.current_frame < self.buffer_threshold {
self.buffer()
} else {
Command::none()
}
} else {
Command::none()
}
} else {
// no more frames
self.buffer()
}
}
VideoPlayerMessage::BufferingComplete {
fully_buffered,
packet_count,
} => {
self.buffering = false;
self.fully_buffered = fully_buffered;
self.packet_count = packet_count;
Command::none()
}
}
}
pub fn subscription(&self) -> Subscription<VideoPlayerMessage> {
if !self.paused {
time::every(Duration::from_secs_f32(1.0 / self.framerate))
.map(|_| VideoPlayerMessage::NextFrame)
} else {
Subscription::none()
}
}
pub fn view(&mut self) -> Image {
Image::new(
self.frame
.clone()
.unwrap_or_else(|| image::Handle::from_pixels(0, 0, vec![])),
)
.into()
}
}
struct VideoData {
ictx: ffmpeg::format::context::Input,
video_stream_index: usize,
decoder: ffmpeg::codec::decoder::Video,
scaler: ffmpeg::software::scaling::Context,
}
impl VideoData {
fn new<P: AsRef<std::path::Path>>(path: &P) -> Result<Self, ffmpeg::Error> {
ffmpeg::init()?;
let ictx = ffmpeg::format::input(path)?;
let input = ictx.streams().best(ffmpeg::media::Type::Video).unwrap();
let video_stream_index = input.index();
let decoder = input.codec().decoder().video()?;
let scaler = ffmpeg::software::scaling::Context::get(
decoder.format(),
decoder.width(),
decoder.height(),
ffmpeg::format::Pixel::BGRA,
decoder.width(),
decoder.height(),
ffmpeg::software::scaling::Flags::BILINEAR,
)?;
Ok(VideoData {
ictx,
video_stream_index,
decoder,
scaler,
})
}
}