rename TranscriptionAdapter to BatchAdapter, add StreamingAdapter interface

internal/testutil/testutil.go

@@ -122,7 +122,7 @@ func MockAudioFrame(data []byte) recording.AudioFrame {
 	}
 }
 
-// MockTranscriberAdapter implements transcriber.TranscriptionAdapter for testing
+// MockTranscriberAdapter implements transcriber.BatchAdapter for testing
 type MockTranscriberAdapter struct {
 	TranscribeFunc func(ctx context.Context, audioData []byte) (string, error)
 }

internal/transcriber/adapter_elevenlabs.go

@@ -12,7 +12,7 @@ import (
 	"time"
 )
 
-// ElevenLabsAdapter implements TranscriptionAdapter for ElevenLabs Scribe API
+// ElevenLabsAdapter implements BatchAdapter for ElevenLabs Scribe API
 type ElevenLabsAdapter struct {
 	client *http.Client
 	config Config

internal/transcriber/adapter_groq_transcription.go

@@ -11,7 +11,7 @@ import (
 	"github.com/sashabaranov/go-openai"
 )
 
-// GroqTranscriptionAdapter implements TranscriptionAdapter for Groq Whisper API
+// GroqTranscriptionAdapter implements BatchAdapter for Groq Whisper API
 type GroqTranscriptionAdapter struct {
 	client *openai.Client
 	config Config

internal/transcriber/adapter_groq_translation.go

@@ -11,7 +11,7 @@ import (
 	"github.com/sashabaranov/go-openai"
 )
 
-// GroqTranslationAdapter implements TranscriptionAdapter for Groq Translation API
+// GroqTranslationAdapter implements BatchAdapter for Groq Translation API
 // Translates audio to English text. The Language field in config hints at the source language.
 type GroqTranslationAdapter struct {
 	client *openai.Client

internal/transcriber/adapter_mistral.go

@@ -10,7 +10,7 @@ import (
 	"github.com/sashabaranov/go-openai"
 )
 
-// MistralAdapter implements TranscriptionAdapter for Mistral Voxtral API
+// MistralAdapter implements BatchAdapter for Mistral Voxtral API
 type MistralAdapter struct {
 	client *openai.Client
 	config Config

internal/transcriber/adapter_openai.go

@@ -11,7 +11,7 @@ import (
 	"github.com/sashabaranov/go-openai"
 )
 
-// OpenAIAdapter implements TranscriptionAdapter for OpenAI Whisper API
+// OpenAIAdapter implements BatchAdapter for OpenAI Whisper API
 type OpenAIAdapter struct {
 	client *openai.Client
 	config Config

internal/transcriber/simple_transcriber.go

@@ -11,7 +11,7 @@ import (
 
 // SimpleTranscriber collects all audio and transcribes when stopped
 type SimpleTranscriber struct {
-	adapter TranscriptionAdapter
+	adapter BatchAdapter
 	config  Config
 
 	// Audio collection
@@ -27,7 +27,7 @@ type SimpleTranscriber struct {
 	transcriptionText string
 }
 
-func NewSimpleTranscriber(config Config, adapter TranscriptionAdapter) *SimpleTranscriber {
+func NewSimpleTranscriber(config Config, adapter BatchAdapter) *SimpleTranscriber {
 	return &SimpleTranscriber{
 		adapter: adapter,
 		config:  config,

internal/transcriber/streaming.go

@@ -0,0 +1,25 @@
+package transcriber
+
+import "context"
+
+// TranscriptionResult represents a single transcription result from a streaming adapter
+type TranscriptionResult struct {
+	Text    string // the transcription text (partial or final)
+	IsFinal bool   // true if this is a final result, false for interim results
+	Error   error  // non-nil if an error occurred
+}
+
+// StreamingAdapter interface for streaming transcription backends (send audio in real-time)
+type StreamingAdapter interface {
+	// Start initiates the streaming connection with the given language setting
+	Start(ctx context.Context, language string) error
+
+	// SendChunk sends a chunk of audio data to the transcription service
+	SendChunk(audio []byte) error
+
+	// Results returns a channel that receives transcription results (partial and final)
+	Results() <-chan TranscriptionResult
+
+	// Close gracefully closes the streaming connection
+	Close() error
+}

internal/transcriber/transcriber.go

@@ -14,8 +14,8 @@ type Transcriber interface {
 	GetFinalTranscription() (string, error)
 }
 
-// Adapter interface for different transcription backends
+// BatchAdapter interface for batch transcription backends (collect all audio, transcribe at end)
-type TranscriptionAdapter interface {
+type BatchAdapter interface {
 	Transcribe(ctx context.Context, audioData []byte) (string, error)
 }
 
@@ -31,7 +31,7 @@ type Config struct {
 // NewTranscriber creates a new simple transcriber
 func NewTranscriber(config Config) (Transcriber, error) {
 	// Create the appropriate adapter
-	var adapter TranscriptionAdapter
+	var adapter BatchAdapter
 
 	switch config.Provider {
 	case "openai":

internal/transcriber/transcriber_test.go

@@ -195,12 +195,12 @@ func TestConfig(t *testing.T) {
 	}
 }
 
-// MockTranscriptionAdapter implements TranscriptionAdapter for testing
+// MockBatchAdapter implements BatchAdapter for testing
-type MockTranscriptionAdapter struct {
+type MockBatchAdapter struct {
 	TranscribeFunc func(ctx context.Context, audioData []byte) (string, error)
 }
 
-func (m *MockTranscriptionAdapter) Transcribe(ctx context.Context, audioData []byte) (string, error) {
+func (m *MockBatchAdapter) Transcribe(ctx context.Context, audioData []byte) (string, error) {
 	if m.TranscribeFunc != nil {
 		return m.TranscribeFunc(ctx, audioData)
 	}
@@ -215,7 +215,7 @@ func TestSimpleTranscriber_Start(t *testing.T) {
 		Model:    "whisper-1",
 	}
 
-	adapter := &MockTranscriptionAdapter{}
+	adapter := &MockBatchAdapter{}
 	transcriber := NewSimpleTranscriber(config, adapter)
 
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
@@ -255,7 +255,7 @@ func TestSimpleTranscriber_Stop(t *testing.T) {
 		Model:    "whisper-1",
 	}
 
-	adapter := &MockTranscriptionAdapter{}
+	adapter := &MockBatchAdapter{}
 	transcriber := NewSimpleTranscriber(config, adapter)
 
 	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
@@ -299,7 +299,7 @@ func TestSimpleTranscriber_GetFinalTranscription(t *testing.T) {
 		Model:    "whisper-1",
 	}
 
-	adapter := &MockTranscriptionAdapter{
+	adapter := &MockBatchAdapter{
 		TranscribeFunc: func(ctx context.Context, audioData []byte) (string, error) {
 			return "test transcription", nil
 		},
@@ -327,7 +327,7 @@ func TestSimpleTranscriber_CollectAudio(t *testing.T) {
 		Model:    "whisper-1",
 	}
 
-	adapter := &MockTranscriptionAdapter{}
+	adapter := &MockBatchAdapter{}
 	transcriber := NewSimpleTranscriber(config, adapter)
 
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
@@ -411,7 +411,7 @@ func TestSimpleTranscriber_TranscribeAll(t *testing.T) {
 				Model:    "whisper-1",
 			}
 
-			adapter := &MockTranscriptionAdapter{
+			adapter := &MockBatchAdapter{
 				TranscribeFunc: func(ctx context.Context, audioData []byte) (string, error) {
 					return tt.mockResult, tt.mockError
 				},
@@ -452,7 +452,7 @@ func TestNewSimpleTranscriber(t *testing.T) {
 		Model:    "whisper-1",
 	}
 
-	adapter := &MockTranscriptionAdapter{}
+	adapter := &MockBatchAdapter{}
 	transcriber := NewSimpleTranscriber(config, adapter)
 
 	if transcriber == nil {
@@ -478,7 +478,7 @@ func TestNewSimpleTranscriber(t *testing.T) {
 }
 
 func TestTranscriptionAdapter(t *testing.T) {
-	adapter := &MockTranscriptionAdapter{
+	adapter := &MockBatchAdapter{
 		TranscribeFunc: func(ctx context.Context, audioData []byte) (string, error) {
 			return "test result", nil
 		},

progress.txt

@@ -40,3 +40,13 @@ Started: Sun Feb  1 12:22:47 AM CET 2026
 - Updated TUI files to use ModelsOfType instead of old SupportsTranscription/SupportsLLM
 - Added comprehensive tests for all new helper functions
 - All tests passing, typecheck passes
+
+### Task 5: Define BatchAdapter and StreamingAdapter interfaces
+- Renamed `TranscriptionAdapter` to `BatchAdapter` in transcriber.go
+- Updated all adapters (openai, groq, mistral, elevenlabs) to reference BatchAdapter in comments
+- Updated SimpleTranscriber to use BatchAdapter
+- Updated test mocks (MockTranscriptionAdapter -> MockBatchAdapter)
+- Created `internal/transcriber/streaming.go` with:
+  - `TranscriptionResult` struct: Text, IsFinal, Error fields
+  - `StreamingAdapter` interface: Start, SendChunk, Results, Close methods
+- All tests passing, typecheck passes

tasks/prd.jsonc

@@ -129,7 +129,7 @@
 				"TranscriptionResult has Text, IsFinal, Error fields",
 				"Typecheck passes"
 			],
-			"passes": false
+			"passes": true
 		},
 		{
 			"title": "Create StreamingTranscriber wrapper",