Esempio n. 1
0
        public void DrawOneSide(Samples samples, Graphics gr, Rectangle bounds, bool normalize = false)
        {
            var kx = bounds.Width / samples.Values.Length;
            var ky = bounds.Height;
            var cy = bounds.Bottom;
            var cx = bounds.Left;

            var values = samples.Values;
            if (normalize)
            {
                var s = samples.Clone();
                s.Normalize();
                values = s.Values;
            }

            using (var pen = new Pen(ForeColor))
            for (int i = 0; i < values.Length; i++)
            {
                var x = i * kx;
                var y = values[i];
                if (y > 1) y = 1;
                if (y < -1) continue;
                y = y * ky;
                gr.DrawLine(pen, cx + x, cy, cx + x, cy - y);
            }
        }
Esempio n. 2
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        public Samples Clone()
        {
            var result = new Samples();
            result.Bitrate = Bitrate;
            result.Values = new float[Values.Length];
            Array.Copy(Values, result.Values, Values.Length);

            return result;
        }
Esempio n. 3
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        public void Process(Audio item, AudioInfo info)
        {
            var tempogram = new Tempogram();

            var s = info.Samples;

            s = new EnvelopeProcessor(factory).Build(info.Samples, 32, false);
            var s2 = new Samples() { Values = new float[s.Values.Length], Bitrate = s.Bitrate };
            var intensity = 0;

            for (int i = 0; i < s.Values.Length - 1; i++)
            {
                var d = s.Values[i + 1] - s.Values[i];
                var dd = d > 0 ? d : 0;
                s.Values[i] = dd;
                s2.Values[i] = d;
                if (d > minAmplitudeChangeForIntensityRate)
                    intensity++;
            }
            s.Values[s.Values.Length - 1] = 0;
            s2.Values[s.Values.Length - 1] = 0;

            var time = s.Values.Length / s.Bitrate;//time of sound

            var maxShift = (int)(s.Values.Length * (maxRithmDuration / time));

            var autoCorr1 = AutoCorr(s.Values, maxShift, 5);
            var autoCorr2 = AutoCorr(s2.Values, maxShift, 2);
            var l = (float)autoCorr1.Length;
            var k = Math.Log(2);
            var list1 = new List<KeyValuePair<float, float>>();
            var list2 = new List<KeyValuePair<float, float>>();
            for (int i = 0; i < l; i++)
            {
                var j = i / (float)l;
                j = (float)(Math.Log(j + 1) / k);
                list1.Add(new KeyValuePair<float, float>(j, autoCorr1[i]));

                var v = autoCorr2[i];
                list2.Add(new KeyValuePair<float, float>(j, v > 0 ? v : 0));
            }
            tempogram.LongTempogram.Build(list1);
            tempogram.ShortTempogram.Build(list2);

            tempogram.Intensity = (float)intensity / time;

            CalcTempo(tempogram);

            //save to audio item
            item.Data.Add(tempogram);
        }
Esempio n. 4
0
        /// <summary>
        /// Amplitude envelope builder
        /// </summary>
        public Samples Build(Samples source, int targetBitrate = 20, bool differentiate = false)
        {
            float k = 1f * targetBitrate /source.Bitrate;
            var values = source.Values;
            var resValues = new float[(int)(values.Length * k)+1];

            for (int i = values.Length - 2; i >= 0; i--)
            {
                var ii = (int) (i*k);
                var prev = resValues[ii];
                var f = values[i];
                if (differentiate) f = values[i + 1] - f;
                if(f < 0) f = -f;

                if (prev < f) resValues[ii] = f;
            }

            return new Samples() { Bitrate = targetBitrate, Values = resValues };
        }