103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
package asr
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import (
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"context"
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"fmt"
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"io"
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"time"
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)
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// Service provides speech-to-text functionality
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type Service interface {
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TranscribeStream(ctx context.Context, audioStream io.Reader) (<-chan TranscriptEvent, error)
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Transcribe(ctx context.Context, audioData []byte) (string, error)
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}
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// TranscriptEvent represents a transcription event
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type TranscriptEvent struct {
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Type string `json:"type"` // "partial" or "final"
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Text string `json:"text"`
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Confidence float64 `json:"confidence,omitempty"`
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Timestamp int64 `json:"timestamp"`
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Words []Word `json:"words,omitempty"`
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}
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// Word represents a word with timing information
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type Word struct {
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Word string `json:"word"`
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StartTime float64 `json:"start_time"`
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EndTime float64 `json:"end_time"`
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Confidence float64 `json:"confidence,omitempty"`
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}
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// MockASRService is a mock implementation for development
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type MockASRService struct{}
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// NewMockASRService creates a new mock ASR service
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func NewMockASRService() *MockASRService {
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return &MockASRService{}
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}
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// TranscribeStream transcribes an audio stream
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func (s *MockASRService) TranscribeStream(ctx context.Context, audioStream io.Reader) (<-chan TranscriptEvent, error) {
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events := make(chan TranscriptEvent, 10)
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go func() {
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defer close(events)
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// Mock implementation - in production, integrate with Deepgram, Google STT, etc.
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// For now, just send a mock event
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select {
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case <-ctx.Done():
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return
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case events <- TranscriptEvent{
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Type: "final",
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Text: "Hello, how can I help you today?",
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Confidence: 0.95,
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Timestamp: time.Now().Unix(),
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}:
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}
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}()
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return events, nil
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}
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// Transcribe transcribes audio data
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func (s *MockASRService) Transcribe(ctx context.Context, audioData []byte) (string, error) {
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// Mock implementation
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return "Hello, how can I help you today?", nil
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}
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// DeepgramASRService integrates with Deepgram (example - requires API key)
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type DeepgramASRService struct {
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apiKey string
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}
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// NewDeepgramASRService creates a new Deepgram ASR service
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func NewDeepgramASRService(apiKey string) *DeepgramASRService {
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return &DeepgramASRService{
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apiKey: apiKey,
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}
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}
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// TranscribeStream transcribes using Deepgram streaming API
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func (s *DeepgramASRService) TranscribeStream(ctx context.Context, audioStream io.Reader) (<-chan TranscriptEvent, error) {
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events := make(chan TranscriptEvent, 10)
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// TODO: Implement Deepgram streaming API integration
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// This would involve:
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// 1. Establishing WebSocket connection to Deepgram
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// 2. Sending audio chunks
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// 3. Receiving partial and final transcripts
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// 4. Converting to TranscriptEvent format
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return events, fmt.Errorf("not implemented - requires Deepgram API integration")
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}
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// Transcribe transcribes using Deepgram REST API
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func (s *DeepgramASRService) Transcribe(ctx context.Context, audioData []byte) (string, error) {
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// TODO: Implement Deepgram REST API integration
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return "", fmt.Errorf("not implemented - requires Deepgram API integration")
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}
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