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whisper.cpp/bindings/go/pkg/whisper/context.go

252 lines
6.4 KiB

package whisper
import (
"io"
"strings"
"time"
// Bindings
whisper "github.com/ggerganov/whisper.cpp/bindings/go"
)
///////////////////////////////////////////////////////////////////////////////
// TYPES
type context struct {
n int
model *model
params whisper.Params
}
// Make sure context adheres to the interface
var _ Context = (*context)(nil)
///////////////////////////////////////////////////////////////////////////////
// LIFECYCLE
func newContext(model *model, params whisper.Params) (Context, error) {
context := new(context)
context.model = model
context.params = params
// Return success
return context, nil
}
///////////////////////////////////////////////////////////////////////////////
// PUBLIC METHODS
// Set the language to use for speech recognition.
func (context *context) SetLanguage(lang string) error {
if context.model.ctx == nil {
return ErrInternalAppError
}
if !context.model.IsMultilingual() {
return ErrModelNotMultilingual
}
if id := context.model.ctx.Whisper_lang_id(lang); id < 0 {
return ErrUnsupportedLanguage
} else if err := context.params.SetLanguage(id); err != nil {
return err
}
// Return success
return nil
}
func (context *context) IsMultilingual() bool {
return context.model.IsMultilingual()
}
// Get language
func (context *context) Language() string {
return whisper.Whisper_lang_str(context.params.Language())
}
// Set translate flag
func (context *context) SetTranslate(v bool) {
context.params.SetTranslate(v)
}
// Set speedup flag
func (context *context) SetSpeedup(v bool) {
context.params.SetSpeedup(v)
}
// Set number of threads to use
func (context *context) SetThreads(v uint) {
context.params.SetThreads(int(v))
}
// Set time offset
func (context *context) SetOffset(v time.Duration) {
context.params.SetOffset(int(v.Milliseconds()))
}
// Set duration of audio to process
func (context *context) SetDuration(v time.Duration) {
context.params.SetOffset(int(v.Milliseconds()))
}
// Set timestamp token probability threshold (~0.01)
func (context *context) SetTokenThreshold(t float32) {
context.params.SetTokenThreshold(t)
}
// Set timestamp token sum probability threshold (~0.01)
func (context *context) SetTokenSumThreshold(t float32) {
context.params.SetTokenSumThreshold(t)
}
// Set max segment length in characters
func (context *context) SetMaxSegmentLength(n uint) {
context.params.SetMaxSegmentLength(int(n))
}
// Set max tokens per segment (0 = no limit)
func (context *context) SetMaxTokensPerSegment(n uint) {
context.params.SetMaxTokensPerSegment(int(n))
}
// Process new sample data and return any errors
func (context *context) Process(data []float32, cb SegmentCallback) error {
if context.model.ctx == nil {
return ErrInternalAppError
}
// If the callback is defined then we force on single_segment mode
if cb != nil {
context.params.SetSingleSegment(true)
}
// 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 cb != nil {
num_segments := context.model.ctx.Whisper_full_n_segments()
s0 := num_segments - new
for i := s0; i < num_segments; i++ {
cb(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 cb != nil {
num_segments := context.model.ctx.Whisper_full_n_segments()
s0 := num_segments - new
for i := s0; i < num_segments; i++ {
cb(toSegment(context.model.ctx, i))
}
}
}); err != nil {
return err
}
// Return success
return nil
}
// Return the next segment of tokens
func (context *context) NextSegment() (Segment, error) {
if context.model.ctx == nil {
return Segment{}, ErrInternalAppError
}
if context.n >= context.model.ctx.Whisper_full_n_segments() {
return Segment{}, io.EOF
}
// Populate result
result := toSegment(context.model.ctx, context.n)
// Increment the cursor
context.n++
// Return success
return result, nil
}
// Test for text tokens
func (context *context) IsText(t Token) bool {
switch {
case context.IsBEG(t):
return false
case context.IsSOT(t):
return false
case whisper.Token(t.Id) >= context.model.ctx.Whisper_token_eot():
return false
case context.IsPREV(t):
return false
case context.IsSOLM(t):
return false
case context.IsNOT(t):
return false
default:
return true
}
}
// Test for "begin" token
func (context *context) IsBEG(t Token) bool {
return whisper.Token(t.Id) == context.model.ctx.Whisper_token_beg()
}
// Test for "start of transcription" token
func (context *context) IsSOT(t Token) bool {
return whisper.Token(t.Id) == context.model.ctx.Whisper_token_sot()
}
// Test for "end of transcription" token
func (context *context) IsEOT(t Token) bool {
return whisper.Token(t.Id) == context.model.ctx.Whisper_token_eot()
}
// Test for "start of prev" token
func (context *context) IsPREV(t Token) bool {
return whisper.Token(t.Id) == context.model.ctx.Whisper_token_prev()
}
// Test for "start of lm" token
func (context *context) IsSOLM(t Token) bool {
return whisper.Token(t.Id) == context.model.ctx.Whisper_token_solm()
}
// Test for "No timestamps" token
func (context *context) IsNOT(t Token) bool {
return whisper.Token(t.Id) == context.model.ctx.Whisper_token_not()
}
// Test for token associated with a specific language
func (context *context) IsLANG(t Token, lang string) bool {
if id := context.model.ctx.Whisper_lang_id(lang); id >= 0 {
return whisper.Token(t.Id) == context.model.ctx.Whisper_token_lang(id)
} else {
return false
}
}
///////////////////////////////////////////////////////////////////////////////
// PRIVATE METHODS
func toSegment(ctx *whisper.Context, n int) Segment {
return Segment{
Num: n,
Text: strings.TrimSpace(ctx.Whisper_full_get_segment_text(n)),
Start: time.Duration(ctx.Whisper_full_get_segment_t0(n)) * time.Millisecond * 10,
End: time.Duration(ctx.Whisper_full_get_segment_t1(n)) * time.Millisecond * 10,
Tokens: toTokens(ctx, n),
}
}
func toTokens(ctx *whisper.Context, n int) []Token {
result := make([]Token, ctx.Whisper_full_n_tokens(n))
for i := 0; i < len(result); i++ {
result[i] = Token{
Id: int(ctx.Whisper_full_get_token_id(n, i)),
Text: strings.TrimSpace(ctx.Whisper_full_get_token_text(n, i)),
P: ctx.Whisper_full_get_token_p(n, i),
}
}
return result
}