whisper.cpp/bindings/ruby/ext/ruby_whisper_segment.c

#include <ruby.h>
#include "ruby_whisper.h"

extern const rb_data_type_t ruby_whisper_type;

extern VALUE cSegment;

static void
rb_whisper_segment_mark(void *p)
{
  ruby_whisper_segment *rws = (ruby_whisper_segment *)p;
  rb_gc_mark(rws->context);
}

static size_t
ruby_whisper_segment_memsize(const void *p)
{
  const ruby_whisper_segment *rws = (const ruby_whisper_segment *)p;
  size_t size = sizeof(rws);
  if (!rws) {
    return 0;
  }
  return size;
}

static const rb_data_type_t ruby_whisper_segment_type = {
  "ruby_whisper_segment",
  {rb_whisper_segment_mark, RUBY_DEFAULT_FREE, ruby_whisper_segment_memsize,},
  0, 0,
  0
};

VALUE
ruby_whisper_segment_allocate(VALUE klass)
{
  ruby_whisper_segment *rws;
  return TypedData_Make_Struct(klass, ruby_whisper_segment, &ruby_whisper_segment_type, rws);
}

VALUE
rb_whisper_segment_initialize(VALUE context, int index)
{
  ruby_whisper_segment *rws;
  const VALUE segment = ruby_whisper_segment_allocate(cSegment);
  TypedData_Get_Struct(segment, ruby_whisper_segment, &ruby_whisper_segment_type, rws);
  rws->context = context;
  rws->index = index;
  return segment;
};

/*
 * Start time in milliseconds.
 *
 * call-seq:
 *   start_time -> Integer
 */
static VALUE
ruby_whisper_segment_get_start_time(VALUE self)
{
  ruby_whisper_segment *rws;
  TypedData_Get_Struct(self, ruby_whisper_segment, &ruby_whisper_segment_type, rws);
  ruby_whisper *rw;
  TypedData_Get_Struct(rws->context, ruby_whisper, &ruby_whisper_type, rw);
  const int64_t t0 = whisper_full_get_segment_t0(rw->context, rws->index);
  // able to multiply 10 without overflow because to_timestamp() in whisper.cpp does it
  return INT2NUM(t0 * 10);
}

/*
 * End time in milliseconds.
 *
 * call-seq:
 *   end_time -> Integer
 */
static VALUE
ruby_whisper_segment_get_end_time(VALUE self)
{
  ruby_whisper_segment *rws;
  TypedData_Get_Struct(self, ruby_whisper_segment, &ruby_whisper_segment_type, rws);
  ruby_whisper *rw;
  TypedData_Get_Struct(rws->context, ruby_whisper, &ruby_whisper_type, rw);
  const int64_t t1 = whisper_full_get_segment_t1(rw->context, rws->index);
  // able to multiply 10 without overflow because to_timestamp() in whisper.cpp does it
  return INT2NUM(t1 * 10);
}

/*
 * Whether the next segment is predicted as a speaker turn.
 *
 * call-seq:
 *   speaker_turn_next? -> bool
 */
static VALUE
ruby_whisper_segment_get_speaker_turn_next(VALUE self)
{
  ruby_whisper_segment *rws;
  TypedData_Get_Struct(self, ruby_whisper_segment, &ruby_whisper_segment_type, rws);
  ruby_whisper *rw;
  TypedData_Get_Struct(rws->context, ruby_whisper, &ruby_whisper_type, rw);
  return whisper_full_get_segment_speaker_turn_next(rw->context, rws->index) ? Qtrue : Qfalse;
}

/*
 * call-seq:
 *   text -> String
 */
static VALUE
ruby_whisper_segment_get_text(VALUE self)
{
  ruby_whisper_segment *rws;
  TypedData_Get_Struct(self, ruby_whisper_segment, &ruby_whisper_segment_type, rws);
  ruby_whisper *rw;
  TypedData_Get_Struct(rws->context, ruby_whisper, &ruby_whisper_type, rw);
  const char * text = whisper_full_get_segment_text(rw->context, rws->index);
  return rb_str_new2(text);
}

/*
 * call-seq:
 *   no_speech_prob -> Float
 */
static VALUE
ruby_whisper_segment_get_no_speech_prob(VALUE self)
{
  ruby_whisper_segment *rws;
  TypedData_Get_Struct(self, ruby_whisper_segment, &ruby_whisper_segment_type, rws);
  ruby_whisper *rw;
  TypedData_Get_Struct(rws->context, ruby_whisper, &ruby_whisper_type, rw);
  return DBL2NUM(whisper_full_get_segment_no_speech_prob(rw->context, rws->index));
}

void
init_ruby_whisper_segment(VALUE *mWhisper, VALUE *cContext)
{
  cSegment  = rb_define_class_under(*mWhisper, "Segment", rb_cObject);

  rb_define_alloc_func(cSegment, ruby_whisper_segment_allocate);
  rb_define_method(cSegment, "start_time", ruby_whisper_segment_get_start_time, 0);
  rb_define_method(cSegment, "end_time", ruby_whisper_segment_get_end_time, 0);
  rb_define_method(cSegment, "speaker_next_turn?", ruby_whisper_segment_get_speaker_turn_next, 0);
  rb_define_method(cSegment, "text", ruby_whisper_segment_get_text, 0);
  rb_define_method(cSegment, "no_speech_prob", ruby_whisper_segment_get_no_speech_prob, 0);
}