651 lines
23 KiB
Rust
651 lines
23 KiB
Rust
use std::path::{Path, PathBuf};
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use std::f32::consts::PI;
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use serde::{Deserialize, Serialize};
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/// Windowed sinc interpolation for high-quality time stretching
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/// This is stateless and can handle arbitrary fractional positions
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#[inline]
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fn sinc(x: f32) -> f32 {
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if x.abs() < 1e-5 {
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1.0
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} else {
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let px = PI * x;
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px.sin() / px
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}
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}
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/// Blackman window function
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#[inline]
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fn blackman_window(x: f32, width: f32) -> f32 {
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if x.abs() > width {
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0.0
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} else {
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let a0 = 0.42;
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let a1 = 0.5;
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let a2 = 0.08;
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// Map x from [-width, width] to [0, 1] for proper Blackman window evaluation
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let n = (x / width + 1.0) / 2.0;
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a0 - a1 * (2.0 * PI * n).cos() + a2 * (4.0 * PI * n).cos()
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}
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}
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/// High-quality windowed sinc interpolation
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/// Uses a 32-tap windowed sinc kernel for smooth, artifact-free interpolation
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/// frac: fractional position to interpolate at (0.0 to 1.0)
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/// samples: array of samples centered around the target position
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#[inline]
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fn windowed_sinc_interpolate(samples: &[f32], frac: f32) -> f32 {
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let mut result = 0.0;
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let kernel_size = samples.len();
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let half_kernel = (kernel_size / 2) as f32;
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for i in 0..kernel_size {
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// Distance from interpolation point
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// samples[half_kernel] is at position 0, we want to interpolate at position frac
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let x = frac + half_kernel - (i as f32);
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let sinc_val = sinc(x);
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let window_val = blackman_window(x, half_kernel);
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result += samples[i] * sinc_val * window_val;
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}
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result
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}
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/// Audio file stored in the pool
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#[derive(Debug, Clone)]
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pub struct AudioFile {
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pub path: PathBuf,
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pub data: Vec<f32>, // Interleaved samples
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pub channels: u32,
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pub sample_rate: u32,
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pub frames: u64,
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}
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impl AudioFile {
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/// Create a new AudioFile
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pub fn new(path: PathBuf, data: Vec<f32>, channels: u32, sample_rate: u32) -> Self {
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let frames = (data.len() / channels as usize) as u64;
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Self {
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path,
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data,
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channels,
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sample_rate,
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frames,
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}
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}
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/// Get duration in seconds
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pub fn duration_seconds(&self) -> f64 {
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self.frames as f64 / self.sample_rate as f64
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}
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/// Generate a waveform overview with the specified number of peaks
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/// This creates a downsampled representation suitable for timeline visualization
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pub fn generate_waveform_overview(&self, target_peaks: usize) -> Vec<crate::io::WaveformPeak> {
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if self.frames == 0 || target_peaks == 0 {
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return Vec::new();
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}
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let total_frames = self.frames as usize;
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let frames_per_peak = (total_frames / target_peaks).max(1);
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let actual_peaks = (total_frames + frames_per_peak - 1) / frames_per_peak;
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let mut peaks = Vec::with_capacity(actual_peaks);
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for peak_idx in 0..actual_peaks {
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let start_frame = peak_idx * frames_per_peak;
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let end_frame = ((peak_idx + 1) * frames_per_peak).min(total_frames);
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let mut min = 0.0f32;
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let mut max = 0.0f32;
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// Scan all samples in this window
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for frame_idx in start_frame..end_frame {
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// For multi-channel audio, combine all channels
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for ch in 0..self.channels as usize {
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let sample_idx = frame_idx * self.channels as usize + ch;
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if sample_idx < self.data.len() {
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let sample = self.data[sample_idx];
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min = min.min(sample);
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max = max.max(sample);
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}
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}
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}
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peaks.push(crate::io::WaveformPeak { min, max });
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}
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peaks
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}
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}
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/// Pool of shared audio files
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pub struct AudioPool {
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files: Vec<AudioFile>,
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}
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impl AudioPool {
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/// Create a new empty audio pool
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pub fn new() -> Self {
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Self {
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files: Vec::new(),
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}
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}
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/// Get the number of files in the pool
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pub fn len(&self) -> usize {
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self.files.len()
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}
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/// Check if the pool is empty
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pub fn is_empty(&self) -> bool {
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self.files.is_empty()
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}
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/// Get file info for waveform generation (duration, sample_rate, channels)
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pub fn get_file_info(&self, pool_index: usize) -> Option<(f64, u32, u32)> {
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self.files.get(pool_index).map(|file| {
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(file.duration_seconds(), file.sample_rate, file.channels)
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})
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}
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/// Generate waveform overview for a file in the pool
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pub fn generate_waveform(&self, pool_index: usize, target_peaks: usize) -> Option<Vec<crate::io::WaveformPeak>> {
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self.files.get(pool_index).map(|file| {
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file.generate_waveform_overview(target_peaks)
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})
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}
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/// Add an audio file to the pool and return its index
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pub fn add_file(&mut self, file: AudioFile) -> usize {
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let index = self.files.len();
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self.files.push(file);
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index
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}
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/// Get an audio file by index
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pub fn get_file(&self, index: usize) -> Option<&AudioFile> {
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self.files.get(index)
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}
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/// Get number of files in the pool
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pub fn file_count(&self) -> usize {
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self.files.len()
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}
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/// Render audio from a file in the pool with high-quality windowed sinc interpolation
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/// start_time_seconds: position in the audio file to start reading from (in seconds)
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/// Returns the number of samples actually rendered
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pub fn render_from_file(
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&self,
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pool_index: usize,
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output: &mut [f32],
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start_time_seconds: f64,
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gain: f32,
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engine_sample_rate: u32,
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engine_channels: u32,
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) -> usize {
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let Some(audio_file) = self.files.get(pool_index) else {
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return 0;
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};
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let src_channels = audio_file.channels as usize;
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let dst_channels = engine_channels as usize;
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let output_frames = output.len() / dst_channels;
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// Calculate starting position in source with fractional precision
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let src_start_position = start_time_seconds * audio_file.sample_rate as f64;
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// Sample rate conversion ratio
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let rate_ratio = audio_file.sample_rate as f64 / engine_sample_rate as f64;
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// Kernel size for windowed sinc (32 taps = high quality, good performance)
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const KERNEL_SIZE: usize = 32;
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const HALF_KERNEL: usize = KERNEL_SIZE / 2;
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let mut rendered_frames = 0;
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// Render frame by frame with windowed sinc interpolation
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for output_frame in 0..output_frames {
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// Calculate exact fractional position in source
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let src_position = src_start_position + (output_frame as f64 * rate_ratio);
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let src_frame = src_position.floor() as i32;
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let frac = (src_position - src_frame as f64) as f32;
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// Check if we've gone past the end of the audio file
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if src_frame < 0 || src_frame as usize >= audio_file.frames as usize {
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break;
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}
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// Interpolate each channel
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for dst_ch in 0..dst_channels {
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let sample = if src_channels == dst_channels {
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// Direct channel mapping
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let ch_offset = dst_ch;
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// Extract channel samples for interpolation
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let mut channel_samples = Vec::with_capacity(KERNEL_SIZE);
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for i in -(HALF_KERNEL as i32)..(HALF_KERNEL as i32) {
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let idx = src_frame + i;
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if idx >= 0 && (idx as usize) < audio_file.frames as usize {
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let sample_idx = (idx as usize) * src_channels + ch_offset;
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channel_samples.push(audio_file.data[sample_idx]);
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} else {
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channel_samples.push(0.0);
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}
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}
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windowed_sinc_interpolate(&channel_samples, frac)
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} else if src_channels == 1 && dst_channels > 1 {
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// Mono to stereo - duplicate
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let mut channel_samples = Vec::with_capacity(KERNEL_SIZE);
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for i in -(HALF_KERNEL as i32)..(HALF_KERNEL as i32) {
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let idx = src_frame + i;
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if idx >= 0 && (idx as usize) < audio_file.frames as usize {
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channel_samples.push(audio_file.data[idx as usize]);
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} else {
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channel_samples.push(0.0);
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}
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}
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windowed_sinc_interpolate(&channel_samples, frac)
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} else if src_channels > 1 && dst_channels == 1 {
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// Multi-channel to mono - average all source channels
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let mut sum = 0.0;
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for src_ch in 0..src_channels {
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let mut channel_samples = Vec::with_capacity(KERNEL_SIZE);
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for i in -(HALF_KERNEL as i32)..(HALF_KERNEL as i32) {
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let idx = src_frame + i;
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if idx >= 0 && (idx as usize) < audio_file.frames as usize {
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let sample_idx = (idx as usize) * src_channels + src_ch;
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channel_samples.push(audio_file.data[sample_idx]);
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} else {
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channel_samples.push(0.0);
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}
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}
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sum += windowed_sinc_interpolate(&channel_samples, frac);
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}
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sum / src_channels as f32
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} else {
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// Mismatched channels - use modulo mapping
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let src_ch = dst_ch % src_channels;
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let mut channel_samples = Vec::with_capacity(KERNEL_SIZE);
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for i in -(HALF_KERNEL as i32)..(HALF_KERNEL as i32) {
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let idx = src_frame + i;
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if idx >= 0 && (idx as usize) < audio_file.frames as usize {
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let sample_idx = (idx as usize) * src_channels + src_ch;
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channel_samples.push(audio_file.data[sample_idx]);
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} else {
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channel_samples.push(0.0);
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}
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}
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windowed_sinc_interpolate(&channel_samples, frac)
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};
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// Mix into output with gain
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let output_idx = output_frame * dst_channels + dst_ch;
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output[output_idx] += sample * gain;
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}
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rendered_frames += 1;
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}
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rendered_frames * dst_channels
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}
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}
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impl Default for AudioPool {
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fn default() -> Self {
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Self::new()
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}
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}
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/// Embedded audio data stored as base64 in the project file
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct EmbeddedAudioData {
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/// Base64-encoded audio data
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pub data_base64: String,
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/// Original file format (wav, mp3, etc.)
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pub format: String,
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}
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/// Serializable audio pool entry for project save/load
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#[derive(Debug, Clone, Serialize, Deserialize)]
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pub struct AudioPoolEntry {
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/// Index in the audio pool
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pub pool_index: usize,
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/// Original filename
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pub name: String,
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/// Path relative to project file (None if embedded)
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pub relative_path: Option<String>,
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/// Duration in seconds
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pub duration: f64,
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/// Sample rate
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pub sample_rate: u32,
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/// Number of channels
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pub channels: u32,
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/// Embedded audio data (for files < 10MB)
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pub embedded_data: Option<EmbeddedAudioData>,
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}
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impl AudioPool {
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/// Serialize the audio pool for project saving
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///
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/// Files smaller than 10MB are embedded as base64.
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/// Larger files are stored as relative paths to the project file.
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pub fn serialize(&self, project_path: &Path) -> Result<Vec<AudioPoolEntry>, String> {
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let project_dir = project_path.parent()
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.ok_or_else(|| "Project path has no parent directory".to_string())?;
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let mut entries = Vec::new();
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for (index, file) in self.files.iter().enumerate() {
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let file_path = &file.path;
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let file_path_str = file_path.to_string_lossy();
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// Check if this is a temp file (from recording) or previously embedded audio
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// Always embed these
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let is_temp_file = file_path.starts_with(std::env::temp_dir());
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let is_embedded = file_path_str.starts_with("<embedded:");
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// Try to get relative path (unless it's a temp/embedded file)
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let relative_path = if is_temp_file || is_embedded {
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None // Don't store path for temp/embedded files, they'll be embedded
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} else if let Some(rel) = pathdiff::diff_paths(file_path, project_dir) {
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Some(rel.to_string_lossy().to_string())
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} else {
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// Fall back to absolute path if relative path fails
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Some(file_path.to_string_lossy().to_string())
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};
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// Check if we should embed this file
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// Always embed temp files (recordings) and previously embedded audio,
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// otherwise use size threshold
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let embedded_data = if is_temp_file || is_embedded || Self::should_embed(file_path) {
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// Embed from memory - we already have the audio data loaded
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Some(Self::embed_from_memory(file))
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} else {
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None
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};
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let entry = AudioPoolEntry {
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pool_index: index,
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name: file_path
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.file_name()
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.map(|n| n.to_string_lossy().to_string())
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.unwrap_or_else(|| format!("file_{}", index)),
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relative_path,
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duration: file.duration_seconds(),
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sample_rate: file.sample_rate,
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channels: file.channels,
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embedded_data,
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};
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entries.push(entry);
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}
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Ok(entries)
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}
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/// Check if a file should be embedded (< 10MB)
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fn should_embed(file_path: &Path) -> bool {
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const TEN_MB: u64 = 10_000_000;
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std::fs::metadata(file_path)
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.map(|m| m.len() < TEN_MB)
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.unwrap_or(false)
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}
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/// Embed audio from memory (already loaded in the pool)
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fn embed_from_memory(audio_file: &AudioFile) -> EmbeddedAudioData {
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use base64::{Engine as _, engine::general_purpose};
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// Convert the f32 interleaved samples to WAV format bytes
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let wav_data = Self::encode_wav(
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&audio_file.data,
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audio_file.channels,
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audio_file.sample_rate
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);
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let data_base64 = general_purpose::STANDARD.encode(&wav_data);
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EmbeddedAudioData {
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data_base64,
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format: "wav".to_string(),
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}
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}
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/// Encode f32 interleaved samples as WAV file bytes
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fn encode_wav(samples: &[f32], channels: u32, sample_rate: u32) -> Vec<u8> {
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let num_samples = samples.len();
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let bytes_per_sample = 4; // 32-bit float
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let data_size = num_samples * bytes_per_sample;
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let file_size = 36 + data_size;
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let mut wav_data = Vec::with_capacity(44 + data_size);
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// RIFF header
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wav_data.extend_from_slice(b"RIFF");
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wav_data.extend_from_slice(&(file_size as u32).to_le_bytes());
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wav_data.extend_from_slice(b"WAVE");
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// fmt chunk
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wav_data.extend_from_slice(b"fmt ");
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wav_data.extend_from_slice(&16u32.to_le_bytes()); // chunk size
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wav_data.extend_from_slice(&3u16.to_le_bytes()); // format code (3 = IEEE float)
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wav_data.extend_from_slice(&(channels as u16).to_le_bytes());
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wav_data.extend_from_slice(&sample_rate.to_le_bytes());
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wav_data.extend_from_slice(&(sample_rate * channels * bytes_per_sample as u32).to_le_bytes()); // byte rate
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wav_data.extend_from_slice(&((channels * bytes_per_sample as u32) as u16).to_le_bytes()); // block align
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wav_data.extend_from_slice(&32u16.to_le_bytes()); // bits per sample
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// data chunk
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wav_data.extend_from_slice(b"data");
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wav_data.extend_from_slice(&(data_size as u32).to_le_bytes());
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// Write samples as little-endian f32
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for &sample in samples {
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wav_data.extend_from_slice(&sample.to_le_bytes());
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}
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wav_data
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}
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/// Load audio pool from serialized entries
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///
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/// Returns a list of pool indices that failed to load (missing files).
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/// The caller should present these to the user for resolution.
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pub fn load_from_serialized(
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&mut self,
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entries: Vec<AudioPoolEntry>,
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project_path: &Path,
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) -> Result<Vec<usize>, String> {
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let project_dir = project_path.parent()
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.ok_or_else(|| "Project path has no parent directory".to_string())?;
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let mut missing_indices = Vec::new();
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// Clear existing pool
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self.files.clear();
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// Find the maximum pool index to determine required size
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let max_index = entries.iter()
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.map(|e| e.pool_index)
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.max()
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.unwrap_or(0);
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// Ensure we have space for all entries
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self.files.resize(max_index + 1, AudioFile::new(PathBuf::new(), Vec::new(), 2, 44100));
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for entry in entries {
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let success = if let Some(embedded) = entry.embedded_data {
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// Load from embedded data
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match Self::load_from_embedded_into_pool(self, entry.pool_index, embedded, &entry.name) {
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Ok(_) => {
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eprintln!("[AudioPool] Successfully loaded embedded audio: {}", entry.name);
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true
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}
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Err(e) => {
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eprintln!("[AudioPool] Failed to load embedded audio {}: {}", entry.name, e);
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false
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}
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}
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} else if let Some(rel_path) = entry.relative_path {
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// Load from file path
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let full_path = project_dir.join(&rel_path);
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|
|
if full_path.exists() {
|
|
Self::load_file_into_pool(self, entry.pool_index, &full_path).is_ok()
|
|
} else {
|
|
eprintln!("[AudioPool] File not found: {:?}", full_path);
|
|
false
|
|
}
|
|
} else {
|
|
eprintln!("[AudioPool] Entry has neither embedded data nor path: {}", entry.name);
|
|
false
|
|
};
|
|
|
|
if !success {
|
|
missing_indices.push(entry.pool_index);
|
|
}
|
|
}
|
|
|
|
Ok(missing_indices)
|
|
}
|
|
|
|
/// Load audio from embedded base64 data
|
|
fn load_from_embedded_into_pool(
|
|
&mut self,
|
|
pool_index: usize,
|
|
embedded: EmbeddedAudioData,
|
|
name: &str,
|
|
) -> Result<(), String> {
|
|
use base64::{Engine as _, engine::general_purpose};
|
|
|
|
// Decode base64
|
|
let data = general_purpose::STANDARD
|
|
.decode(&embedded.data_base64)
|
|
.map_err(|e| format!("Failed to decode base64: {}", e))?;
|
|
|
|
// Write to temporary file for symphonia to decode
|
|
let temp_dir = std::env::temp_dir();
|
|
let temp_path = temp_dir.join(format!("lightningbeam_embedded_{}.{}", pool_index, embedded.format));
|
|
|
|
std::fs::write(&temp_path, &data)
|
|
.map_err(|e| format!("Failed to write temporary file: {}", e))?;
|
|
|
|
// Load the temporary file using existing infrastructure
|
|
let result = Self::load_file_into_pool(self, pool_index, &temp_path);
|
|
|
|
// Clean up temporary file
|
|
let _ = std::fs::remove_file(&temp_path);
|
|
|
|
// Update the path to reflect it was embedded
|
|
if result.is_ok() && pool_index < self.files.len() {
|
|
self.files[pool_index].path = PathBuf::from(format!("<embedded: {}>", name));
|
|
}
|
|
|
|
result
|
|
}
|
|
|
|
/// Load an audio file into a specific pool index
|
|
fn load_file_into_pool(&mut self, pool_index: usize, file_path: &Path) -> Result<(), String> {
|
|
use symphonia::core::audio::SampleBuffer;
|
|
use symphonia::core::codecs::{DecoderOptions, CODEC_TYPE_NULL};
|
|
use symphonia::core::formats::FormatOptions;
|
|
use symphonia::core::io::MediaSourceStream;
|
|
use symphonia::core::meta::MetadataOptions;
|
|
use symphonia::core::probe::Hint;
|
|
|
|
let file = std::fs::File::open(file_path)
|
|
.map_err(|e| format!("Failed to open audio file: {}", e))?;
|
|
|
|
let mss = MediaSourceStream::new(Box::new(file), Default::default());
|
|
|
|
let mut hint = Hint::new();
|
|
if let Some(ext) = file_path.extension() {
|
|
hint.with_extension(&ext.to_string_lossy());
|
|
}
|
|
|
|
let format_opts = FormatOptions::default();
|
|
let metadata_opts = MetadataOptions::default();
|
|
let decoder_opts = DecoderOptions::default();
|
|
|
|
let probed = symphonia::default::get_probe()
|
|
.format(&hint, mss, &format_opts, &metadata_opts)
|
|
.map_err(|e| format!("Failed to probe audio file: {}", e))?;
|
|
|
|
let mut format = probed.format;
|
|
let track = format
|
|
.tracks()
|
|
.iter()
|
|
.find(|t| t.codec_params.codec != CODEC_TYPE_NULL)
|
|
.ok_or_else(|| "No audio track found".to_string())?;
|
|
|
|
let mut decoder = symphonia::default::get_codecs()
|
|
.make(&track.codec_params, &decoder_opts)
|
|
.map_err(|e| format!("Failed to create decoder: {}", e))?;
|
|
|
|
let track_id = track.id;
|
|
let sample_rate = track.codec_params.sample_rate.unwrap_or(44100);
|
|
let channels = track.codec_params.channels.map(|c| c.count()).unwrap_or(2) as u32;
|
|
|
|
let mut samples = Vec::new();
|
|
let mut sample_buf = None;
|
|
|
|
loop {
|
|
let packet = match format.next_packet() {
|
|
Ok(packet) => packet,
|
|
Err(_) => break,
|
|
};
|
|
|
|
if packet.track_id() != track_id {
|
|
continue;
|
|
}
|
|
|
|
match decoder.decode(&packet) {
|
|
Ok(decoded) => {
|
|
if sample_buf.is_none() {
|
|
let spec = *decoded.spec();
|
|
let duration = decoded.capacity() as u64;
|
|
sample_buf = Some(SampleBuffer::<f32>::new(duration, spec));
|
|
}
|
|
|
|
if let Some(ref mut buf) = sample_buf {
|
|
buf.copy_interleaved_ref(decoded);
|
|
samples.extend_from_slice(buf.samples());
|
|
}
|
|
}
|
|
Err(_) => continue,
|
|
}
|
|
}
|
|
|
|
let audio_file = AudioFile::new(
|
|
file_path.to_path_buf(),
|
|
samples,
|
|
channels,
|
|
sample_rate,
|
|
);
|
|
|
|
if pool_index >= self.files.len() {
|
|
return Err(format!("Pool index {} out of bounds", pool_index));
|
|
}
|
|
|
|
self.files[pool_index] = audio_file;
|
|
Ok(())
|
|
}
|
|
|
|
/// Resolve a missing audio file by loading from a new path
|
|
/// This is called from the UI when the user manually locates a missing file
|
|
pub fn resolve_missing_file(&mut self, pool_index: usize, new_path: &Path) -> Result<(), String> {
|
|
Self::load_file_into_pool(self, pool_index, new_path)
|
|
}
|
|
}
|