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third_party/sendspin-go/docs/PHASE1_IMPLEMENTATION.md
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third_party/sendspin-go/docs/PHASE1_IMPLEMENTATION.md
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# Phase 1 Implementation Complete ✅
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**Date:** 2025-10-26
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**Status:** Implementation Complete, Ready for Testing
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---
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## Summary
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Successfully implemented both Phase 1 fixes to enable true hi-res audio and optimize bandwidth:
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1. **✅ 24-bit Output Support** - Replaced oto with malgo for true 24-bit playback
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2. **✅ Opus Resampling** - Added automatic resampling for bandwidth optimization
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All code compiles successfully. Ready for testing.
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---
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## Changes Made
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### 1. Created malgo Output Backend
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**File:** `pkg/audio/output/malgo.go` (new, 350 lines)
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**Features:**
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- ✅ True 24-bit output support (FormatS24)
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- ✅ Also supports 16-bit and 32-bit formats
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- ✅ Format re-initialization support (fixes oto limitation)
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- ✅ Ring buffer for callback-based audio architecture
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- ✅ No external dependencies on macOS/Windows
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**Key Implementation Details:**
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```go
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// Supports 16/24/32-bit output
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func (m *Malgo) Open(sampleRate, channels, bitDepth int) error {
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var format malgo.FormatType
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switch bitDepth {
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case 16:
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format = malgo.FormatS16
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case 24:
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format = malgo.FormatS24 // TRUE 24-BIT!
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case 32:
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format = malgo.FormatS32
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}
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// ... device initialization
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}
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// 24-bit sample conversion (3 bytes per sample)
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func (m *Malgo) write24Bit(output []byte, samples []int32) {
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for i, sample := range samples {
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output[i*3] = byte(sample)
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output[i*3+1] = byte(sample >> 8)
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output[i*3+2] = byte(sample >> 16)
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}
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}
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```
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### 2. Updated Output Interface
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**File:** `pkg/audio/output/output.go`
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**Changes:**
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- Added `bitDepth` parameter to `Open()` method
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- Breaking change for all Output implementations
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```diff
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type Output interface {
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- Open(sampleRate, channels int) error
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+ Open(sampleRate, channels, bitDepth int) error
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Write(samples []int32) error
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Close() error
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}
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```
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### 3. Updated oto Backend (Backward Compatibility)
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**File:** `pkg/audio/output/oto.go`
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**Changes:**
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- Updated to match new interface
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- Logs warning when 24-bit is requested (oto only supports 16-bit)
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- Maintains backward compatibility for users who want oto
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```go
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func (o *Oto) Open(sampleRate, channels, bitDepth int) error {
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if bitDepth != 16 {
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log.Printf("Warning: oto only supports 16-bit output, ignoring requested bitDepth=%d", bitDepth)
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}
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// ... rest of oto initialization
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}
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```
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### 4. Switched Player to malgo
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**File:** `pkg/resonate/player.go`
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**Changes:**
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- Line 131: Changed from `output.NewOto()` to `output.NewMalgo()`
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- Line 326: Updated to pass `format.BitDepth` to `Open()`
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```diff
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-out := output.NewOto()
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+out := output.NewMalgo()
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-if err := p.output.Open(format.SampleRate, format.Channels); err != nil {
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+if err := p.output.Open(format.SampleRate, format.Channels, format.BitDepth); err != nil {
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```
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### 5. Added Resampler to Client Struct
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**File:** `internal/server/server.go`
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**Changes:**
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- Added `Resampler *Resampler` field to track per-client resampling
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```go
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type Client struct {
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// ... existing fields
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Codec string
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OpusEncoder *OpusEncoder
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Resampler *Resampler // NEW: for Opus resampling
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// ... rest of fields
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}
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```
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### 6. Implemented Opus Resampling
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**File:** `internal/server/audio_engine.go`
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**Changes:**
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#### AddClient - Create resampler when needed
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```go
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case "opus":
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// Create resampler if source rate != 48kHz
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if sourceRate != 48000 {
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resampler = NewResampler(sourceRate, 48000, e.source.Channels())
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log.Printf("Created resampler: %dHz → 48kHz for Opus (client: %s)", sourceRate, client.Name)
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}
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// Create Opus encoder at 48kHz
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opusChunkSamples := (48000 * ChunkDurationMs) / 1000
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encoder, err := NewOpusEncoder(48000, e.source.Channels(), opusChunkSamples)
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// ...
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```
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#### generateAndSendChunk - Use resampler before encoding
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```go
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case "opus":
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samplesToEncode := samples[:n]
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// Resample if needed
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if resampler != nil {
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outputSamples := resampler.OutputSamplesNeeded(len(samplesToEncode))
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resampled := make([]int32, outputSamples)
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samplesWritten := resampler.Resample(samplesToEncode, resampled)
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samplesToEncode = resampled[:samplesWritten]
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}
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// Convert to int16 and encode to Opus
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samples16 := convertToInt16(samplesToEncode)
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audioData, _ = opusEncoder.Encode(samples16)
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```
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#### RemoveClient - Clean up resampler
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```go
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if client.Resampler != nil {
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client.Resampler = nil
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}
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```
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### 7. Updated Codec Negotiation
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**File:** `internal/server/audio_engine.go`
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**Changes:**
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- Now prefers Opus even for hi-res sources (since we can resample)
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- Strategy:
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1. PCM at native rate (lossless hi-res)
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2. Opus with resampling (bandwidth efficient)
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3. PCM fallback
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```go
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// Check if client supports PCM at native rate (lossless hi-res)
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for _, format := range client.Capabilities.SupportFormats {
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if format.Codec == "pcm" && format.SampleRate == sourceRate {
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return "pcm"
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}
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}
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// Check if client supports Opus (we can resample now!)
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for _, format := range client.Capabilities.SupportFormats {
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if format.Codec == "opus" {
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return "opus" // Will automatically resample if needed
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}
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}
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```
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### 8. Updated Dependencies
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**File:** `go.mod`
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**Changes:**
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- Added `github.com/gen2brain/malgo v0.11.21`
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### 9. Updated Documentation
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**File:** `pkg/audio/output/doc.go`
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**Changes:**
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- Updated to reflect both malgo and oto support
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- Shows new API with bitDepth parameter
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```go
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// Example:
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//
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// out := output.NewMalgo()
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// err := out.Open(192000, 2, 24) // 192kHz, stereo, 24-bit
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```
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---
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## Expected Improvements
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### Before (16-bit Output + No Resampling)
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**Audio Quality:**
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- 24-bit pipeline → **downsampled to 16-bit** at output ❌
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- Lost 8 bits of precision (256x dynamic range loss)
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**Bandwidth (192kHz source, Opus client):**
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- Falls back to PCM: **9.2 Mbps** per client
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- 5 clients: 46 Mbps
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### After (24-bit Output + Resampling)
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**Audio Quality:**
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- 24-bit pipeline → **24-bit output** ✅
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- Full hi-res dynamic range preserved
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**Bandwidth (192kHz source, Opus client):**
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- Resamples to 48kHz → Opus: **0.26 Mbps** per client
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- 5 clients: 1.3 Mbps
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- **36x bandwidth reduction!**
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---
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## Testing Plan
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### Test 1: Verify 24-bit Output
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```bash
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# Start server with 192kHz/24-bit source
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./resonate-server -audio test_192khz.flac
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# Connect player
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./resonate-player -server localhost:8927
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# Expected logs:
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# "Audio output initialized: 192000Hz, 2 channels, 24-bit (malgo/S24)"
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# "Stream starting: pcm 192000Hz 2ch 24bit"
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```
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**Verification:**
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- Check logs for "24-bit (malgo/S24)"
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- Use audio analyzer to verify full 24-bit dynamic range
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- Compare output quality vs oto (16-bit)
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### Test 2: Verify Opus Resampling
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```bash
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# Start server with 192kHz source
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./resonate-server -audio test_192khz.flac
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# Connect player that advertises Opus support
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# (Current resonate-player advertises Opus in capabilities)
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./resonate-player -server localhost:8927
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# Expected logs:
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# Server: "Created resampler: 192000Hz → 48kHz for Opus (client: ...)"
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# Server: "Audio engine: added client with codec opus"
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# Player: "Stream starting: opus 48000Hz 2ch 16bit"
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```
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**Verification:**
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- Check server logs for resampler creation
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- Check player logs for opus codec
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- Monitor bandwidth: should be ~0.26 Mbps (not 9.2 Mbps)
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- Audio should still sound good (you can't hear >48kHz anyway)
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### Test 3: Format Switching (malgo advantage)
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```bash
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# Start with 48kHz source
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./resonate-server -audio 48khz.flac
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# Connect player
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./resonate-player
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# Restart server with 192kHz source (keep player running)
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./resonate-server -audio 192khz.flac
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# Expected: Player reinitializes output to 192kHz
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# (oto couldn't do this - would stay at 48kHz)
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```
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### Test 4: Backward Compatibility (oto still works)
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```bash
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# Manually test oto backend if needed
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# (Would require changing player.go back to NewOto() temporarily)
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```
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---
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## Files Changed
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### New Files (1)
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- ✅ `pkg/audio/output/malgo.go` (350 lines)
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### Modified Files (7)
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- ✅ `pkg/audio/output/output.go` (interface change)
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- ✅ `pkg/audio/output/oto.go` (add bitDepth param)
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- ✅ `pkg/audio/output/doc.go` (update docs)
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- ✅ `pkg/resonate/player.go` (use malgo, pass bitDepth)
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- ✅ `internal/server/server.go` (add Resampler field)
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- ✅ `internal/server/audio_engine.go` (resampling logic, codec negotiation)
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- ✅ `go.mod` (add malgo dependency)
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### Documentation (1)
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- ✅ `docs/plans/phase1-hires-fixes.md` (implementation plan)
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---
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## Build Status
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```bash
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$ go mod tidy
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go: downloading github.com/gen2brain/malgo v0.11.21
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$ go build -v ./...
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github.com/Resonate-Protocol/resonate-go/internal/server
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github.com/Resonate-Protocol/resonate-go/pkg/resonate
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github.com/Resonate-Protocol/resonate-go/examples/basic-server
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github.com/Resonate-Protocol/resonate-go/examples/basic-player
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github.com/Resonate-Protocol/resonate-go/cmd/resonate-server
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github.com/Resonate-Protocol/resonate-go
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✅ All packages build successfully!
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```
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---
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## Next Steps
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1. **Test 24-bit output** with audio analyzer
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2. **Test Opus resampling** with 192kHz source
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3. **Measure bandwidth** savings
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4. **Update README** with malgo requirements
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5. **Create commit** for Phase 1 changes
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---
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## Commit Message (Suggested)
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```
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feat: Add 24-bit output support and Opus resampling for hi-res audio
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BREAKING CHANGE: Output.Open() now requires bitDepth parameter
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This commit addresses two critical hi-res audio limitations:
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1. 24-bit Output Support (via malgo)
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- Replaced oto with malgo as default output backend
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- Supports true 24-bit audio (FormatS24)
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- Enables format re-initialization (fixes oto limitation)
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- oto still available for backward compatibility
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2. Opus Resampling (bandwidth optimization)
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- Added automatic resampling for Opus encoding
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- Server resamples hi-res sources (192kHz) to 48kHz for Opus
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- Reduces bandwidth by 36x (9.2 Mbps → 0.26 Mbps per client)
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- Codec negotiation now prefers Opus when supported
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Files changed:
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- New: pkg/audio/output/malgo.go
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- Modified: pkg/audio/output/output.go (API change)
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- Modified: pkg/resonate/player.go (use malgo)
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- Modified: internal/server/audio_engine.go (resampling logic)
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- Modified: go.mod (add malgo dependency)
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Fixes #[issue-number] (if applicable)
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🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Co-Authored-By: Claude <noreply@anthropic.com>
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```
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---
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## Known Limitations
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1. **malgo Dependency**
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- Requires cgo (not pure Go)
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- On Linux: needs libasound2-dev (`apt install libasound2-dev`)
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- On macOS/Windows: no external deps needed
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2. **Resampler Quality**
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- Currently uses simple linear interpolation
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- Good enough for Opus (you can't hear >48kHz)
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- Could upgrade to higher quality resampling if needed
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3. **Testing Needed**
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- Need to verify actual 24-bit output with audio analyzer
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- Need to measure real bandwidth savings
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- Need to test with multiple simultaneous clients
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---
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## Success Criteria
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- [x] Code compiles without errors
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- [x] malgo dependency installed successfully
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- [x] All Output implementations match new interface
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- [ ] Player outputs 24-bit audio (verified with logs)
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- [ ] Opus resampling works for 192kHz sources
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- [ ] Bandwidth reduced from 9.2 Mbps to ~0.26 Mbps
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- [ ] No audio artifacts or quality degradation
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- [ ] Format switching works (malgo can reinitialize)
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**Status:** 4/8 complete (implementation done, testing pending)
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