114 lines
4.1 KiB
C#
114 lines
4.1 KiB
C#
#region --- License ---
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/* Licensed under the MIT/X11 license.
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* Copyright (c) 2006-2008 the OpenTK Team.
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* This notice may not be removed from any source distribution.
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* See license.txt for licensing details.
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*/
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#endregion
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using System;
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using System.Diagnostics;
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using System.Threading;
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using System.IO;
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using OpenTK.Audio;
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using OpenTK.Audio.OpenAL;
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namespace Examples
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{
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[Example("Playback", ExampleCategory.OpenAL, "1.1", Documentation="Playback")]
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public class Playback
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{
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static readonly string filename = Path.Combine(Path.Combine("Data", "Audio"), "the_ring_that_fell.wav");
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// Loads a wave/riff audio file.
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public static byte[] LoadWave(Stream stream, out int channels, out int bits, out int rate)
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{
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if (stream == null)
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throw new ArgumentNullException("stream");
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using (BinaryReader reader = new BinaryReader(stream))
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{
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// RIFF header
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string signature = new string(reader.ReadChars(4));
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if (signature != "RIFF")
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throw new NotSupportedException("Specified stream is not a wave file.");
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int riff_chunck_size = reader.ReadInt32();
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string format = new string(reader.ReadChars(4));
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if (format != "WAVE")
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throw new NotSupportedException("Specified stream is not a wave file.");
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// WAVE header
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string format_signature = new string(reader.ReadChars(4));
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if (format_signature != "fmt ")
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throw new NotSupportedException("Specified wave file is not supported.");
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int format_chunk_size = reader.ReadInt32();
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int audio_format = reader.ReadInt16();
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int num_channels = reader.ReadInt16();
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int sample_rate = reader.ReadInt32();
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int byte_rate = reader.ReadInt32();
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int block_align = reader.ReadInt16();
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int bits_per_sample = reader.ReadInt16();
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string data_signature = new string(reader.ReadChars(4));
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if (data_signature != "data")
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throw new NotSupportedException("Specified wave file is not supported.");
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int data_chunk_size = reader.ReadInt32();
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channels = num_channels;
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bits = bits_per_sample;
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rate = sample_rate;
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return reader.ReadBytes((int)reader.BaseStream.Length);
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}
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}
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public static ALFormat GetSoundFormat(int channels, int bits)
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{
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switch (channels)
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{
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case 1: return bits == 8 ? ALFormat.Mono8 : ALFormat.Mono16;
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case 2: return bits == 8 ? ALFormat.Stereo8 : ALFormat.Stereo16;
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default: throw new NotSupportedException("The specified sound format is not supported.");
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}
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}
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public static void Main()
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{
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using (AudioContext context = new AudioContext())
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{
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int buffer = AL.GenBuffer();
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int source = AL.GenSource();
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int state;
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int channels, bits_per_sample, sample_rate;
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byte[] sound_data = LoadWave(File.Open(filename, FileMode.Open), out channels, out bits_per_sample, out sample_rate);
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AL.BufferData(buffer, GetSoundFormat(channels, bits_per_sample), sound_data, sound_data.Length, sample_rate);
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AL.Source(source, ALSourcei.Buffer, buffer);
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AL.SourcePlay(source);
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Trace.Write("Playing");
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// Query the source to find out when it stops playing.
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do
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{
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Thread.Sleep(250);
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Trace.Write(".");
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AL.GetSource(source, ALGetSourcei.SourceState, out state);
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}
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while ((ALSourceState)state == ALSourceState.Playing);
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Trace.WriteLine("");
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AL.SourceStop(source);
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AL.DeleteSource(source);
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AL.DeleteBuffer(buffer);
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}
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}
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}
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}
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