go : add Encoder Begin Callback (#2900)

Adding in EncoderBeginCallback to the Context's Process callback.
This optional callback function returns false if computation should
be aborted.

Co-authored-by: Amanda Der Bedrosian <aderbedr@gmail.com>

bindings/go/README.md

@@ -31,7 +31,7 @@ func main() {
 	if err != nil {
 		panic(err)
 	}
-	if err := context.Process(samples, nil, nil); err != nil {
+	if err := context.Process(samples, nil, nil, nil); err != nil {
 		return err
 	}
 

bindings/go/examples/go-whisper/process.go

@@ -67,7 +67,7 @@ func Process(model whisper.Model, path string, flags *Flags) error {
 	// Process the data
 	fmt.Fprintf(flags.Output(), "  ...processing %q\n", path)
 	context.ResetTimings()
-	if err := context.Process(data, cb, nil); err != nil {
+	if err := context.Process(data, nil, cb, nil); err != nil {
 		return err
 	}
 

bindings/go/pkg/whisper/context.go

@@ -189,6 +189,7 @@ func (context *context) WhisperLangAutoDetect(offset_ms int, n_threads int) ([]f
 // Process new sample data and return any errors
 func (context *context) Process(
 	data []float32,
+	callEncoderBegin EncoderBeginCallback,
 	callNewSegment SegmentCallback,
 	callProgress ProgressCallback,
 ) error {
@@ -203,7 +204,20 @@ func (context *context) Process(
 	// We don't do parallel processing at the moment
 	processors := 0
 	if processors > 1 {
-		if err := context.model.ctx.Whisper_full_parallel(context.params, data, processors, nil, func(new int) {
+		if err := context.model.ctx.Whisper_full_parallel(context.params, data, processors, callEncoderBegin,
+			func(new int) {
+				if callNewSegment != nil {
+					num_segments := context.model.ctx.Whisper_full_n_segments()
+					s0 := num_segments - new
+					for i := s0; i < num_segments; i++ {
+						callNewSegment(toSegment(context.model.ctx, i))
+					}
+				}
+			}); err != nil {
+			return err
+		}
+	} else if err := context.model.ctx.Whisper_full(context.params, data, callEncoderBegin,
+		func(new int) {
 			if callNewSegment != nil {
 				num_segments := context.model.ctx.Whisper_full_n_segments()
 				s0 := num_segments - new
@@ -211,22 +225,11 @@ func (context *context) Process(
 					callNewSegment(toSegment(context.model.ctx, i))
 				}
 			}
-		}); err != nil {
-			return err
-		}
-	} else if err := context.model.ctx.Whisper_full(context.params, data, nil, func(new int) {
-		if callNewSegment != nil {
-			num_segments := context.model.ctx.Whisper_full_n_segments()
-			s0 := num_segments - new
-			for i := s0; i < num_segments; i++ {
-				callNewSegment(toSegment(context.model.ctx, i))
+		}, func(progress int) {
+			if callProgress != nil {
+				callProgress(progress)
 			}
-		}
-	}, func(progress int) {
-		if callProgress != nil {
-			callProgress(progress)
-		}
-	}); err != nil {
+		}); err != nil {
 		return err
 	}
 

bindings/go/pkg/whisper/context_test.go

@@ -88,6 +88,6 @@ func TestProcess(t *testing.T) {
 	context, err := model.NewContext()
 	assert.NoError(err)
 
-	err = context.Process(data, nil, nil)
+	err = context.Process(data, nil, nil, nil)
 	assert.NoError(err)
 }

bindings/go/pkg/whisper/interface.go

@@ -16,6 +16,10 @@ type SegmentCallback func(Segment)
 // processing. It is called during the Process function
 type ProgressCallback func(int)
 
+// EncoderBeginCallback is the callback function for checking if we want to
+// continue processing. It is called during the Process function
+type EncoderBeginCallback func() bool
+
 // Model is the interface to a whisper model. Create a new model with the
 // function whisper.New(string)
 type Model interface {
@@ -31,7 +35,7 @@ type Model interface {
 	Languages() []string
 }
 
-// Context is the speach recognition context.
+// Context is the speech recognition context.
 type Context interface {
 	SetLanguage(string) error // Set the language to use for speech recognition, use "auto" for auto detect language.
 	SetTranslate(bool)        // Set translate flag
@@ -58,7 +62,7 @@ type Context interface {
 	// Process mono audio data and return any errors.
 	// If defined, newly generated segments are passed to the
 	// callback function during processing.
-	Process([]float32, SegmentCallback, ProgressCallback) error
+	Process([]float32, EncoderBeginCallback, SegmentCallback, ProgressCallback) error
 
 	// After process is called, return segments until the end of the stream
 	// is reached, when io.EOF is returned.