Struct MultiTrackAudioMixer 

pub struct MultiTrackAudioMixer { /* private fields */ }

Mixes multiple audio tracks into a single output stream.

The resulting FilterGraph is source-only — call FilterGraph::pull_audio in a loop to extract the output frames.

Examples

use ff_filter::MultiTrackAudioMixer;
use ff_format::ChannelLayout;
use std::time::Duration;

let mut graph = MultiTrackAudioMixer::new(48000, ChannelLayout::Stereo)
    .add_track(ff_filter::AudioTrack {
        source: "music.mp3".into(),
        volume: ff_filter::AnimatedValue::Static(-3.0),
        pan: ff_filter::AnimatedValue::Static(0.0),
        time_offset: Duration::ZERO,
        effects: vec![],
        sample_rate: 48000,
        channel_layout: ChannelLayout::Stereo,
    })
    .build()?;

while let Some(frame) = graph.pull_audio()? {
    // encode or write `frame`
}

Implementations

impl MultiTrackAudioMixer

pub fn new(sample_rate: u32, layout: ChannelLayout) -> Self

Creates a new mixer with no tracks.

pub fn add_track(self, track: AudioTrack) -> Self

Appends an audio track and returns the updated mixer.

pub fn build(self) -> Result<FilterGraph, FilterError>

Builds a source-only FilterGraph that mixes all tracks.

Errors

• FilterError::CompositionFailed — no tracks were added, or an underlying FFmpeg graph-construction call failed.