SoundBufferRecorder.cs

using System;
using System.Collections.Generic;

namespace SFML.Audio
{
    ////////////////////////////////////////////////////////////
    /// <summary>
    /// Specialized SoundRecorder which saves the captured
    /// audio data into a sound buffer
    /// </summary>
    ////////////////////////////////////////////////////////////
    public class SoundBufferRecorder : SoundRecorder
    {
        ////////////////////////////////////////////////////////////
        /// <summary>
        /// Sound buffer containing the captured audio data
        ///
        /// The sound buffer is valid only after the capture has ended.
        /// This function provides a reference to the internal
        /// sound buffer, but you should make a copy of it if you want
        /// to make any modifications to it.
        /// </summary>
        ////////////////////////////////////////////////////////////
        public SoundBuffer SoundBuffer { get; private set; }

        ////////////////////////////////////////////////////////////
        /// <summary>
        /// Provide a string describing the object
        /// </summary>
        /// <returns>String description of the object</returns>
        ////////////////////////////////////////////////////////////
        public override string ToString()
        {
            if (IsInvalid)
            {
                return MakeDisposedObjectString();
            }

            return "[SoundBufferRecorder]" +
                   " SampleRate(" + SampleRate + ")" +
                   " SoundBuffer(" + SoundBuffer + ")";
        }

        ////////////////////////////////////////////////////////////
        /// <summary>
        /// Called when a new capture starts
        /// </summary>
        /// <returns>False to abort recording audio data, true to continue</returns>
        ////////////////////////////////////////////////////////////
        protected override bool OnStart()
        {
            _samplesArray.Clear();
            return true;
        }

        ////////////////////////////////////////////////////////////
        /// <summary>
        /// Process a new chunk of recorded samples
        /// </summary>
        /// <param name="samples">Array of samples to process</param>
        /// <returns>False to stop recording audio data, true to continue</returns>
        ////////////////////////////////////////////////////////////
        protected override bool OnProcessSamples(ReadOnlySpan<short> samples)
        {
            for (var i = 0; i < samples.Length; i++)
            {
                _samplesArray.Add(samples[i]);
            }
            return true;
        }

        ////////////////////////////////////////////////////////////
        /// <summary>
        /// Called when the current capture stops
        /// </summary>
        ////////////////////////////////////////////////////////////
        protected override void OnStop() => SoundBuffer = new SoundBuffer(_samplesArray.ToArray(), 1, SampleRate, _channels);

        private readonly List<short> _samplesArray = new List<short>();
        private static readonly SoundChannel[] _channels = new SoundChannel[]
        {
            SoundChannel.Mono
        };
    }
}