C# (CSharp) SampleRate.src_float_to_short_array Examples

Example #1

        private unsafe void RenderAudioCallback(XtStream stream, object input, object output, int frames, double time,
                                                ulong position, bool timeValid, ulong error, object user)
        {
            var sampleCount = frames * 2; // 2 channels per frame, interleaved

            if (_scenes.Length == 0)
            {
                for (var i = 0; i < sampleCount; i++)
                {
                    unsafe
                    {
                        ((float *)((IntPtr)output).ToPointer())[i] = 0;
                    }
                }

                return;
            }

            var firstSceneFrames = _scenes[0].GetAudioData(frames);

            if (firstSceneFrames == null)
            {
                Array.Clear(_tmpAudioBuffer, 0, sampleCount);
            }
            else
            {
                Array.Copy(firstSceneFrames, _tmpAudioBuffer, sampleCount);
            }

//            for (var i = 1; i < _scenes.Length; i++)
//            {
//                var sceneFrames = _scenes[i].GetAudioData(frames);
//
//                if (null == sceneFrames) continue;
//
//                // Actual mixing. TODO: Optimize using SIMD intrinsics
//                for (var j = 0; j < sampleCount; j++)
//                {
//                    var a = sceneFrames[j];
//                    var b = _tmpAudioBuffer[j];
//
//                    _tmpAudioBuffer[j] = a + b - a * b;
//                }
//            }

            fixed(float *dataPtr = &_tmpAudioBuffer[0])
            {
                SampleRate.src_float_to_short_array(dataPtr, (short *)((IntPtr)output).ToPointer(),
                                                    sampleCount);
            }
        }