Esempio n. 1
0
        public WaveGenerator(IEnumerable <Note> notes)
        {
            // Init chunks
            header = new WaveHeader();
            format = new WaveFormatChunk();
            data   = new WaveDataChunk();

            var milliseconds = notes.Select((x) => x.Duration.TotalMilliseconds).Sum();
            //var seconds = (uint)(milliseconds / 1000);

            // Number of samples = sample rate * channels * bytes per sample
            // Multiply first, then divide to avoid rounding errors
            uint numSamples = (uint)(((format.dwSamplesPerSec * milliseconds) / 1000) * format.wChannels);

            // Initialize the 16-bit array
            data.shortArray = new short[numSamples];

            int amplitude = 32760;  // Max amplitude for 16-bit audio

            uint sampleCount = 0;

            foreach (var n in notes)
            {
                // The "angle" used in the function, adjusted for the number of channels and sample rate.
                // This value is like the period of the wave.
                double t = (Math.PI * 2 * n.Frequency) / (format.dwSamplesPerSec * format.wChannels);

                var samplesThisNote = format.dwSamplesPerSec * format.wChannels * n.Duration.TotalSeconds;

                // Loop over sampleCount rather than from 0, because you don't want to reset
                // the sine wave for repeated notes of the same pitch
                for (uint i = sampleCount; i < (samplesThisNote + sampleCount) - 1; i++)
                {
                    // Fill with a simple sine wave at max amplitude
                    for (int channel = 0; channel < format.wChannels; channel++)
                    {
                        data.shortArray[i + channel] = Convert.ToInt16(amplitude * Math.Sin(t * i));
                    }
                }
                sampleCount += (uint)samplesThisNote;
            }
            // Calculate data chunk size in bytes
            data.dwChunkSize = (uint)(data.shortArray.Length * (format.wBitsPerSample / 8));
        }
Esempio n. 2
0
        /// <summary>
        /// Initializes the object and generates a wave.
        /// </summary>
        /// <param name="type">The type of wave to generate</param>
        public WaveGenerator(WaveExampleType type, double freq, uint seconds)
        {
            // Init chunks
            header = new WaveHeader();
            format = new WaveFormatChunk();
            data   = new WaveDataChunk();

            // Fill the data array with sample data
            switch (type)
            {
            case WaveExampleType.ExampleSineWave:

                // Number of samples = sample rate * channels * bytes per sample
                uint numSamples = format.dwSamplesPerSec * format.wChannels * seconds;

                // Initialize the 16-bit array
                data.shortArray = new short[numSamples];

                int amplitude = 32760;      // Max amplitude for 16-bit audio

                // The "angle" used in the function, adjusted for the number of channels and sample rate.
                // This value is like the period of the wave.
                double t = (Math.PI * 2 * freq) / (format.dwSamplesPerSec * format.wChannels);

                for (uint i = 0; i < numSamples - 1; i++)
                {
                    // Fill with a simple sine wave at max amplitude
                    for (int channel = 0; channel < format.wChannels; channel++)
                    {
                        data.shortArray[i + channel] = Convert.ToInt16(amplitude * Math.Sin(t * i));
                    }
                }

                // Calculate data chunk size in bytes
                data.dwChunkSize = (uint)(data.shortArray.Length * (format.wBitsPerSample / 8));

                break;
            }
        }
Esempio n. 3
0
        /// <summary>
        /// Initializes the object and generates a wave.
        /// </summary>
        /// <param name="type">The type of wave to generate</param>
        public WaveGenerator(WaveExampleType type, double freq, uint seconds)
        {
            // Init chunks
            header = new WaveHeader();
            format = new WaveFormatChunk();
            data = new WaveDataChunk();

            // Fill the data array with sample data
            switch (type)
            {
                case WaveExampleType.ExampleSineWave:

                    // Number of samples = sample rate * channels * bytes per sample
                    uint numSamples = format.dwSamplesPerSec * format.wChannels * seconds;

                    // Initialize the 16-bit array
                    data.shortArray = new short[numSamples];

                    int amplitude = 32760;  // Max amplitude for 16-bit audio

                    // The "angle" used in the function, adjusted for the number of channels and sample rate.
                    // This value is like the period of the wave.
                    double t = (Math.PI * 2 * freq) / (format.dwSamplesPerSec * format.wChannels);

                    for (uint i = 0; i < numSamples - 1; i++)
                    {
                        // Fill with a simple sine wave at max amplitude
                        for (int channel = 0; channel < format.wChannels; channel++)
                        {
                            data.shortArray[i + channel] = Convert.ToInt16(amplitude * Math.Sin(t * i));
                        }
                    }

                    // Calculate data chunk size in bytes
                    data.dwChunkSize = (uint)(data.shortArray.Length * (format.wBitsPerSample / 8));

                    break;
            }
        }
Esempio n. 4
0
        public WaveGenerator(IEnumerable<Note> notes)
        {
            // Init chunks
            header = new WaveHeader();
            format = new WaveFormatChunk();
            data = new WaveDataChunk();

            var milliseconds = notes.Select((x) => x.Duration.TotalMilliseconds).Sum();
            //var seconds = (uint)(milliseconds / 1000);

            // Number of samples = sample rate * channels * bytes per sample
            // Multiply first, then divide to avoid rounding errors
            uint numSamples = (uint)(((format.dwSamplesPerSec * milliseconds) / 1000) * format.wChannels);

            // Initialize the 16-bit array
            data.shortArray = new short[numSamples];

            int amplitude = 32760;  // Max amplitude for 16-bit audio

            uint sampleCount = 0;

            foreach (var n in notes)
            {
                // The "angle" used in the function, adjusted for the number of channels and sample rate.
                // This value is like the period of the wave.
                double t = (Math.PI * 2 * n.Frequency) / (format.dwSamplesPerSec * format.wChannels);

                var samplesThisNote = format.dwSamplesPerSec * format.wChannels * n.Duration.TotalSeconds;

                // Loop over sampleCount rather than from 0, because you don't want to reset
                // the sine wave for repeated notes of the same pitch
                for (uint i = sampleCount; i < (samplesThisNote + sampleCount) - 1; i++)
                {
                    // Fill with a simple sine wave at max amplitude
                    for (int channel = 0; channel < format.wChannels; channel++)
                    {
                        data.shortArray[i + channel] = Convert.ToInt16(amplitude * Math.Sin(t * i));
                    }
                }
                sampleCount += (uint)samplesThisNote;
            }
            // Calculate data chunk size in bytes
            data.dwChunkSize = (uint)(data.shortArray.Length * (format.wBitsPerSample / 8));
        }