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//! High level audio player control based on MPV
use crate::audio::player::AudioPlayerControls;
use crate::common::errors::MyError;
use libmpv::Mpv;
use std::time::Duration;
/// The AudioPlayer struct handles audio playback using the libmpv backend.
pub struct MpvAudioPlayer {
/// The mpv instance responsible for managing the audio playback.
mpv: Mpv,
/// Current playback speed multiplier (1.0 = normal speed).
current_speed: f64,
}
impl MpvAudioPlayer {
/// Creates a new AudioPlayer instance.
///
/// # Arguments
///
/// * input_path - The path to the audio file to be played.
///
/// # Returns
///
/// A new AudioPlayer instance.
pub(crate) fn new(input_path: &str) -> Result<Self, MyError> {
let mpv = Mpv::new().expect("Failed to init MPV builder");
mpv.set_property("vid", "no")
.map_err(|err| MyError::Audio(format!("Failed to set no-video property: {:?}", err)))?;
mpv.set_property("audio-display", "no").map_err(|err| {
MyError::Audio(format!(
"Failed to set no-audio-display property: {:?}",
err
))
})?;
// Enable pitch-preserving time-stretching (scaletempo2 is MPV's default)
mpv.set_property("audio-pitch-correction", "yes").map_err(|err| {
MyError::Audio(format!(
"Failed to set audio-pitch-correction property: {:?}",
err
))
})?;
mpv.command("loadfile", &[input_path])
.map_err(|err| MyError::Audio(format!("Failed to load audio file: {:?}", err)))?;
mpv.set_property("pause", true)
.map_err(|err| MyError::Audio(format!("Failed to set pause property: {:?}", err)))?;
Ok(Self { mpv, current_speed: 1.0 })
}
}
impl AudioPlayerControls for MpvAudioPlayer {
/// Pauses the audio playback.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn pause(&mut self) -> Result<(), MyError> {
self.mpv
.set_property("pause", true)
.map_err(|err| MyError::Audio(format!("{:?}", err)))
}
/// Resumes the audio playback.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn resume(&mut self) -> Result<(), MyError> {
self.mpv
.set_property("pause", false)
.map_err(|err| MyError::Audio(format!("{:?}", err)))
}
/// Toggles the playback state (play/pause) of the audio.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn toggle_play(&mut self) -> Result<(), MyError> {
let paused = self
.mpv
.get_property("pause")
.map_err(|err| MyError::Audio(format!("{:?}", err)))?;
if paused {
self.resume()
} else {
self.pause()
}
}
/// Mutes the audio playback.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn mute(&mut self) -> Result<(), MyError> {
self.mpv
.set_property("mute", true)
.map_err(|err| MyError::Audio(format!("{:?}", err)))
}
/// Unmutes the audio playback.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn unmute(&mut self) -> Result<(), MyError> {
self.mpv
.set_property("mute", false)
.map_err(|err| MyError::Audio(format!("{:?}", err)))
}
/// Toggles the mute state of the audio.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn toggle_mute(&mut self) -> Result<(), MyError> {
let muted = self
.mpv
.get_property("mute")
.map_err(|err| MyError::Audio(format!("{:?}", err)))?;
if muted {
self.unmute()
} else {
self.mute()
}
}
/// Stops the audio playback.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn stop(&mut self) -> Result<(), MyError> {
self.mpv
.command("stop", &["false"])
.map_err(|err| MyError::Audio(format!("{:?}", err)))
}
fn rewind(&mut self) -> Result<(), MyError> {
// TODO
Err(MyError::Audio(
"Rewind feature not implemented for MPV audio player".to_string(),
))
}
/// Seeks forward or backward by the specified number of seconds.
///
/// # Arguments
///
/// * `seconds` - The number of seconds to seek. Positive seeks forward, negative seeks backward.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn seek(&mut self, seconds: f64) -> Result<(), MyError> {
let seek_arg = format!("{}", seconds);
self.mpv
.command("seek", &[&seek_arg, "relative"])
.map_err(|err| MyError::Audio(format!("Seek failed: {:?}", err)))
}
/// Cycles through available subtitle tracks.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn cycle_subtitle(&mut self) -> Result<(), MyError> {
self.mpv
.command("cycle", &["sub"])
.map_err(|err| MyError::Audio(format!("Cycle subtitle failed: {:?}", err)))
}
/// Toggles subtitle visibility on/off.
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn toggle_subtitle(&mut self) -> Result<(), MyError> {
let visible: bool = self.mpv.get_property("sub-visibility").unwrap_or(true);
self.mpv
.set_property("sub-visibility", !visible)
.map_err(|err| MyError::Audio(format!("Toggle subtitle failed: {:?}", err)))
}
/// Sets the playback speed multiplier (pitch-preserving via scaletempo2).
///
/// # Arguments
///
/// * `speed` - The speed multiplier (1.0 = normal, 0.5 = half, 2.0 = double).
///
/// # Returns
///
/// A `Result` indicating success or an `MyError::Audio` error.
fn set_speed(&mut self, speed: f64) -> Result<(), MyError> {
let clamped_speed = speed.clamp(0.5, 2.0);
self.mpv
.set_property("speed", clamped_speed)
.map_err(|err| MyError::Audio(format!("Set speed failed: {:?}", err)))?;
self.current_speed = clamped_speed;
Ok(())
}
/// Gets the current playback speed multiplier.
///
/// # Returns
///
/// The current speed multiplier.
fn get_speed(&self) -> f64 {
self.current_speed
}
fn get_subtitle_text(&self) -> Option<String> {
self.mpv.get_property::<String>("sub-text").ok()
}
fn get_position(&self) -> Duration {
let pos: f64 = self.mpv.get_property("time-pos").unwrap_or(0.0);
Duration::from_secs_f64(pos.max(0.0))
}
}