Alvas.Net

How to save audio to mp3 on Silverlight 4.

Sun, 28 Feb 2010 00:00:00 GMT

As you know Silverlight 4 supports access to the microphone. Besides it can call COM objects on the client side.

To save the audio in mp3 format we need:

Make the COM object wrapper, which allows us to invoke the necessary Alvas.Audio functionality.

Create AlvasCom project as ClassLibrary.
In AssemblyInfo.cs change the line

[assembly: ComVisible(false)]

to

[assembly: ComVisible(true)]
Add a reference to Alvas.Audio.dll

Add Alvas.Audio-wrapper interface and its implementation. See the code below.

namespace AlvasCom

    [Guid("50B29476-F2C0-4445-B0E1-7D4023453EBD")]

    interface IAudioHost

        void Close();

        void WriteData(short channels, short bitsPerSample, int samplesPerSec, byte[] sampleData);

    [ClassInterface(ClassInterfaceType.None)]

    [Guid("1EA86BAE-420F-4309-BF06-23730718BF5E")]

    public class AudioHost : IAudioHost

        Mp3Writer mw;

        public AudioHost()

            string dir = Environment.GetFolderPath(Environment.SpecialFolder.MyMusic);

            string fileName = Path.ChangeExtension(Path.GetFileName(Path.GetTempFileName()), ".mp3");

            string path = Path.Combine(dir, fileName);

            global::System.Windows.Forms.MessageBox.Show(path);

            mw = new Mp3Writer(File.Create(path));

        public void WriteData(short channels, short bitsPerSample, int samplesPerSec, byte[] sampleData)

            IntPtr sampleFormat = AudioCompressionManager.GetPcmFormat(channels, bitsPerSample, samplesPerSec);

            IntPtr format = AudioCompressionManager.GetCompatibleFormat(sampleFormat, AudioCompressionManager.MpegLayer3FormatTag);

            byte[] data = AudioCompressionManager.Convert(sampleFormat, format, sampleData, false);

            mw.WriteData(data);

        public void Close()

            mw.Close();

Sign the assembly with the snk file.
Register in GAC AlvasCom.dll and Alvas.Audio.dll using gacutil.
Register the COM object using regasm.

You can find AlvasCom.bat in the "SilverlightAudio\AlvasCom\bin\Debug\" folder to register these libraries.

Make the Silverlight application with microphone support.

Create SilverlightAudio project as SilverlightApplication.

To call a COM object, we need elevated privileges and run it out of browser. Add to OutOfBrowserSettings.xml

  <OutOfBrowserSettings.SecuritySettings>
    <SecuritySettings ElevatedPermissions="Required" />
  </OutOfBrowserSettings.SecuritySettings>

Writing code call using the "dynamic" type

namespace SilverlightAudio

    public class MyAudioSync : AudioSink

        dynamic ah;

        AudioFormat audioFormat;

        protected override void OnCaptureStarted()

            ah = ComAutomationFactory.CreateObject("AlvasCom.AudioHost");

        protected override void OnCaptureStopped()

            ah.Close();

        protected override void OnFormatChange(AudioFormat audioFormat)

            this.audioFormat = audioFormat;

        protected override void OnSamples(long sampleTime, long sampleDuration, byte[] sampleData)

            ah.WriteData((short)audioFormat.Channels, (short)audioFormat.BitsPerSample, audioFormat.SamplesPerSecond, sampleData);

Compile and run the application.
Enjoy.

The source code and precompiled examples are here. (SilverlightAudio.zip)

How can we extend this example? Come immediately to mind

Save mp3 file on the server.
Make voice chat, but it is better to use gsm instead of mp3 encoding. How to do it - leave it in the form of homework. Hint #tip60 :)
And what can you propose?

P.S. If you have any problems - please write us.

ID3 tags for Wave files.

Mon, 15 Feb 2010 00:00:00 GMT

ID3 (Identify a MP3) is metadata container most often used for MP3 audio files. ID3 signature contains information about the title track, album, artist name, etc. about the file to be stored in the file itself. Please see ID3.
Wave files can also store metadata similar ID3.

The code below shows how to add, delete, and read metadata from the Wav files.

        private void WaveTag()

        {

            string fileName = "in.wav";

            WaveReadWriter wrw = new WaveReadWriter(File.Open(fileName, FileMode.Open, FileAccess.ReadWrite));

            //removes INFO tags from audio stream 

            wrw.WriteInfoTag(null);

            //writes INFO tags into audio stream 

            Dictionary<WaveInfo, string> tag = new Dictionary<WaveInfo, string>();

            tag[WaveInfo.Comments] = "Comments...";

            wrw.WriteInfoTag(tag);

            wrw.Close();

            //reads INFO tags from audio stream

            WaveReader wr = new WaveReader(File.OpenRead(fileName));

            Dictionary<WaveInfo, string> dir = wr.ReadInfoTag();

            wr.Close();

            if (dir.Count > 0)

            {

                foreach (string val in dir.Values)

                {

                    Console.WriteLine(val);

                }

            }

        }

In addition, we show how to do the same for mp3 files with ID3 Tag V1.0

        private void Mp3Tag()

        {

            string fileName = "in.mp3";

            Mp3ReadWriter mrw = new Mp3ReadWriter(File.Open(fileName, FileMode.Open, FileAccess.ReadWrite));

            //removes ID3v1 tags from audio stream 

            mrw.WriteID3v1Tag(null);

            //writes ID3v1 tags into audio stream 

            ID3v1 tag = new ID3v1();

            tag.Comment = "Comment...";

            mrw.WriteID3v1Tag(tag);

            mrw.Close();

            //reads ID3v1 tags from audio stream 

            Mp3Reader mr = new Mp3Reader(File.OpenRead(fileName));

            ID3v1 id3v1 = mr.ReadID3v1Tag();

            mr.Close();

            if (id3v1 != null)

            {

                Console.WriteLine(id3v1.Comment);

            }

        }

What is ACM driver?

Mon, 15 Feb 2010 00:00:00 GMT

Audio Compression Manager (ACM) is the Windows multimedia framework that manages audio codecs. Codec is a computer program that compresses/decompresses digital audio data according to a given audio file format or streaming audio format.
ACM driver is dynamic-link library (DLL) which contains audio codecs for different audio formats.
ACM drivers can be recognized by their filename extension ".acm". For more details please see Audio Compression Manager

The code below can be used to list ACM codecs installed on your computer and see audio formats for specified codec.

        private void WhatIsAcmDriver()

        {

            foreach (DriverDetails dd in AudioCompressionManager.GetDriverList())

            {

                Console.WriteLine("# # #");

                Console.WriteLine("Driver: {0}", dd.LongName);

                foreach (FormatTagDetails ftd in AudioCompressionManager.GetFormatTagList(dd.Driver))

                {

                    Console.WriteLine("FormatTag: {0}", ftd.FormatTagName);

                    foreach (FormatDetails fd in AudioCompressionManager.GetFormatList(ftd.FormatTag, dd.Driver))

                    {

                        Console.WriteLine("Format: {0}", fd.FormatName);

                    }

                }

            }

        }

Output for "Microsoft GSM 6.10 Audio CODEC" (for example) driver see below

# # #
Driver: Microsoft GSM 6.10 Audio CODEC
FormatTag: GSM 6.10
Format: 8,000 kHz; Mono
Format: 11,025 kHz; Mono
Format: 22,050 kHz; Mono
Format: 44,100 kHz; Mono
FormatTag: PCM
Format: 8,000 kHz; 8 Bit; Mono
Format: 8,000 kHz; 16 Bit; Mono
Format: 11,025 kHz; 8 Bit; Mono
Format: 11,025 kHz; 16 Bit; Mono
Format: 22,050 kHz; 8 Bit; Mono
Format: 22,050 kHz; 16 Bit; Mono
Format: 44,100 kHz; 8 Bit; Mono
Format: 44,100 kHz; 16 Bit; Mono
# # #

How can be one audio file mixed to another?

Mon, 15 Feb 2010 00:00:00 GMT

Question: I have multiple audio tracks with nothing but music.
I have multiple recorded voice tracks no longer than 2-3 seconds each.
What I would like to do is 'overlay' a voice track onto an audio track at a specified time and output the results to a single file.
E.g. Audio track is 2 minutes long, and I would like to insert the voice track at 23 seconds as well 1m 05 seconds and at 1m 40 seconds.
Can Alvas.Audio accomplish this sort of task for me??

Answer: See the code below

Imports System.IO

Imports Alvas.Audio

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        MixMany("c:\audio\files\")

    End Sub

    Private Shared Sub Debug(ByVal name As String, ByVal wf As WaveFormat)

        Dim format As String = "Variable: [{0}], FormatTag: {1}, Channels: {2}, SamplesPerSec: {3}, BitsPerSample: {4}, BlockAlign: {5}, AvgBytesPerSec: {6}"

        Console.WriteLine(format, name, wf.wFormatTag, wf.nChannels, wf.nSamplesPerSec, wf.wBitsPerSample, wf.nBlockAlign, wf.nAvgBytesPerSec)

    End Sub

    Private Shared Sub MixMany(ByVal dir As String)

        Dim format1 As IntPtr

        Dim data1 As Byte()

        ReadData(dir + "The Friendship Song.mp3", format1, data1)

        Dim format2 As IntPtr

        Dim data2 As Byte()

        ReadData(dir + "Kailin 1.mp3", format2, data2)

        Dim wf1 As WaveFormat = AudioCompressionManager.GetWaveFormat(format1)

        Debug("wf1", wf1)

        Dim wf2 As WaveFormat = AudioCompressionManager.GetWaveFormat(format2)

        Debug("wf1", wf2)

        If Not wf1.Equals(wf2) Then

            data2 = AudioCompressionManager.Convert(format2, format1, data2, False)

        End If

        Dim data As Byte() = AudioCompressionManager.MixMany(format1, data1, data2, wf1.nSamplesPerSec * 27.1, wf1.nSamplesPerSec * 83.28)

        Dim formatMp3 As IntPtr = AudioCompressionManager.GetCompatibleFormat(format1, AudioCompressionManager.MpegLayer3FormatTag)

        Debug("wfMp3", AudioCompressionManager.GetWaveFormat(formatMp3))

        Dim dataMp3 As Byte() = AudioCompressionManager.Convert(format1, formatMp3, data, False)

        Dim mw As New Mp3Writer(File.Create(dir + "Test002.mp3"))

        mw.WriteData(dataMp3)

        mw.Close()

        MsgBox("Done!")

    End Sub

    Private Shared Sub ReadData(ByVal fileName As String, ByRef format1 As IntPtr, ByRef data1 As Byte())

        Dim dr1 As New Mp3Reader(File.OpenRead(fileName))

        format1 = dr1.ReadFormat()

        data1 = dr1.ReadData()

        dr1.Close()

        Dim format1Pcm As IntPtr = AudioCompressionManager.GetCompatibleFormat(format1, AudioCompressionManager.PcmFormatTag)

        Dim data1Pcm() As Byte = AudioCompressionManager.Convert(format1, format1Pcm, data1, False)

        format1 = format1Pcm

        data1 = data1Pcm

    End Sub

End Class

2010-02-01 - Alvas.Audio

Mon, 1 Feb 2010 00:00:00 GMT

Alvas.Audio new version has been published.

New features:

Writes ID3 tag version 1 from MPEG Layer3 streams.
Writes INFO metadata(similar mp3 tags) from Wave streams.
Checks audio signal silence.

What is compressed audio format?

Thu, 7 Jan 2010 00:00:00 GMT

Audio compression is a kind of data compression developed to reduce the transmission bandwidth of digital sound streams and the size of audio files. Audio compression algorithms are applied in computer software as audio codecs. The compromise between a little reduced sound quality and transmission or size is outweighed by the last for most practical audio apps in which users may not feel the loss in playback rendition quality.

For instance, one compact disk (CD) contains about one hour of uncompressed (PCM) high quality music, less than 2 hours of music compressed without loss in playback, or 7 hours of music compressed in the MP3 format at medium bit rates.

Lets analyse compressed audio format, for instance, "GSM 6.10". This format is applied to compress the mobile operators speaking on cellular. GSM is applied for over 3 billion people in more than 212 countries and territories.

AudioCompressionManager.GetWaveFormat can analyse the audio format inside.

FormatTag = 49 is "GSM 6.10" format.
Channels = 1 is single-channel.
SamplesPerSec = quantity of digitized values per second (or sampling): 8000 Hz, 11025 Hz, 22050 Hz, 44100 Hz.
BitsPerSample = 0, unimportant for this format.
BlockAlign = 65. The size of the compressed block (in bytes).
AvgBytesPerSec is byterate(Bitrate equal byterate * 8) = 1625. For "GSM 6.10 22050 Hz; Mono".

You can use the code below to look through "GSM 6.10" audio format in more detail.

        private void WhatIsCompressedAudioFormat()
        {
            foreach (FormatDetails fd in AudioCompressionManager.GetFormatList(AudioCompressionManager.Gsm610FormatTag, true))
            {
                WaveFormat wf = AudioCompressionManager.GetWaveFormat(fd.FormatHandle);
                string format = "Format: [{0}], FormatTag: {1}, Channels: {2}, SamplesPerSec: {3}, BitsPerSample: {4}, BlockAlign: {5}, AvgBytesPerSec: {6}";
                Console.WriteLine(format, fd, wf.wFormatTag, wf.nChannels, wf.nSamplesPerSec, wf.wBitsPerSample, wf.nBlockAlign, wf.nAvgBytesPerSec);
            }
        }

What is a PCM format?

Wed, 30 Dec 2009 00:00:00 GMT

PCM (Pulse-code modulation) is an uncompressed audio format. We get the Wav file, that maintains (holds) the PCM data. See how to do What is a Wav-file? Method AudioCompressionManager.GetWaveFormat helps investigate the audio format.

FormatTag = 1 is PCM.
Channels = for single-channel (mono), two-channel (stereo), 8 for 7.1 Surround Sound (left, right, center, left surround, right surround, left rear, right rear positions. 7.1 systems also have 1 channel for low frequency effects (LFE) which is usually sent to a subwoofer).
SamplesPerSec = digitized quantity values per second (or sampling). Could be anything, but the standard values: 8000 Hz, 11025 Hz, 12000 Hz, 16000 Hz, 22050 Hz, 24000 Hz, 32000 Hz, 44100 Hz, 48000 Hz.
BitsPerSample - most common uses 8 bits (1 byte) and 16 bits (2 bytes). Rarely 24 bits (3 bytes), 32 bits (4 bytes) and 64 bits (4 bytes). If we consider the 16 bit as a basic, then 8 bits can be considered as a compressed format. It has two times less size, but the variants of values can be only 2⁸ = 256 instead of 2¹⁶ = 65536 for 16 bits. That's why, 8 bits sound quality will be significantly lower than 16 bits.
BlockAlign = Channels * BitsPerSample / 8. Where 8 is the quantity of bits per byte.
AvgBytesPerSec (bitrate) = Channels * SamplesPerSec * BitsPerSample / 8.

You can use the code below to analyze PCM audio format in more particularly.

        private void WhatIsPcmFormat(string fileName)
        {
            WaveReader wr = new WaveReader(File.OpenRead(fileName));
            IntPtr format = wr.ReadFormat();
            wr.Close();
            WaveFormat wf = AudioCompressionManager.GetWaveFormat(format);
            if (wf.wFormatTag == AudioCompressionManager.PcmFormatTag)
            {
                int bitsPerByte = 8;
                Console.WriteLine("Channels: {0}, SamplesPerSec: {1}, BitsPerSample: {2}, BlockAlignIsEqual: {3}, BytesPerSecIsEqual: {4}", wf.nChannels, wf.nSamplesPerSec, wf.wBitsPerSample, (wf.nChannels * wf.wBitsPerSample) / bitsPerByte == wf.nBlockAlign, (int)(wf.nChannels * wf.nSamplesPerSec * wf.wBitsPerSample) / bitsPerByte == wf.nAvgBytesPerSec);
            }
        }

What is a Wav-file?

Tue, 29 Dec 2009 00:00:00 GMT

WAVE (WAV) is a container format for recording the digitized audio stream. Under Windows, this format is often applied as a wrapper for uncompressed audio (PCM). But, you can put sound in WAV container compressed perhaps in any codec.

In that way your WAV-file can maintain data in various audio formats, such as the CCITT A-Law, CCITT u-Law, ADPCM, Speex, GSM 6.10, MPEG Layer-3 (mp3), Ogg Vorbis and others.

You can use the code below to investigate audio-format data recorded in your WAV-file.

        private void WhatIsWavFile(string fileName)
        {
            WaveReader wr = new WaveReader(File.OpenRead(fileName));
            IntPtr format = wr.ReadFormat();
            wr.Close();
            WaveFormat wf = AudioCompressionManager.GetWaveFormat(format);
            string tag = null;
            switch (wf.wFormatTag)
            {
                case AudioCompressionManager.PcmFormatTag :
                    tag = "PCM";
                    break;
                case AudioCompressionManager.ALawFormatTag :
                    tag = "A-Law";
                    break;
                case AudioCompressionManager.MuLawFormatTag :
                    tag = "Mu-Law";
                    break;
                case AudioCompressionManager.Gsm610FormatTag :
                    tag = "GSM 6.10";
                    break;
                case AudioCompressionManager.ImaAdpcmFormatTag :
                    tag = "IMA ADPCM";
                    break;
                case AudioCompressionManager.AdpcmFormatTag :
                    tag = "Microsoft ADPCM";
                    break;
                case AudioCompressionManager.MpegLayer3FormatTag :
                    tag = "ISO/MPEG Layer3";
                    break;
                default:
                    tag = wf.wFormatTag.ToString();
                    break;
            }
            Console.WriteLine("File '{0}' contains '{1}' data", fileName, tag);
        }

2009-11-04 - Alvas.Audio

Wed, 4 Nov 2009 00:00:00 GMT

Alvas.Audio new version has been published.

New features:

Reads ID3 tag version 1 from MPEG Layer3 streams.
Reads INFO metadata(similar mp3 tags) from Wave streams.
Gets the format list for specified format tag and driver.
Player class can plays Wave file data from array.

2009-03-19 - Alvas.Audio

Thu, 19 Mar 2009 00:00:00 GMT

Alvas.Audio new version has been published.

New features: DsReader class for playback any audio files and decode theirs to PCM using DirectShow filters. Standard supports

MP3 Format Sound: .mp3
Windows Media Audio: .wma
AIFF (.aif .aifc .aiff)
AU (.au .snd)
MIDI (.mid .midi .rmi)
Windows Media Video: .wmv
Advanced Systems Format: .asf
Motion Picture Experts Group: .mpeg
Audio-Video Interleaved: .avi
WAV: wav

Use http://en.wikipedia.org/wiki/K-Lite_Codec_Pack or http://en.wikipedia.org/wiki/Ffdshow to expand the list of supported formats to

Matroska (.mka)
MPEG (.mpa .mp2 .m1a .m2a)
MPEG4 (.m4a .aac)
Musepack (.mpc)
RealMedia (.rm .rmvb .ra .ram)
3GP (.3gp .3gpp .3g2 .3gp2)
FLAC (.flac)
Ogg Vorbis (.ogg)
WavPack (.wv)
Monkey's Audio (.ape)
True Audio (.tta)
Apple Lossless Audio Codec (.alac)
AMR (.amr)
Trackers (.xm .s3m .it .mod .umx)
and much more...

2009-03-15 - Alvas.Controls

Sun, 15 Mar 2009 00:00:00 GMT

Alvas.Controls now can be used in any of your projects for free. Sources still cost money.

2009-03-04 - Alvas.Audio

Wed, 4 Mar 2009 00:00:00 GMT

Alvas.Audio for .Net code name "Helena" 65b1 beta has been released.

New features: DsReader class for playback any audio files and decode theirs to PCM using DirectShow filters. Standard supports

MP3 Format Sound: .mp3
Windows Media Audio: .wma
AIFF (.aif .aifc .aiff)
AU (.au .snd)
MIDI (.mid .midi .rmi)
Windows Media Video: .wmv
Advanced Systems Format: .asf
Motion Picture Experts Group: .mpeg
Audio-Video Interleaved: .avi
WAV: wav

Use http://en.wikipedia.org/wiki/K-Lite_Codec_Pack or http://en.wikipedia.org/wiki/Ffdshow to expand the list of supported formats to

Matroska (.mka)
MPEG (.mpa .mp2 .m1a .m2a)
MPEG4 (.m4a .aac)
Musepack (.mpc)
RealMedia (.rm .rmvb .ra .ram)
3GP (.3gp .3gpp .3g2 .3gp2)
FLAC (.flac)
Ogg Vorbis (.ogg)
WavPack (.wv)
Monkey's Audio (.ape)
True Audio (.tta)
Apple Lossless Audio Codec (.alac)
AMR (.amr)
Trackers (.xm .s3m .it .mod .umx)
and much more...

Direct link: http://alvas.net/Download/Alvas.Audio.65b1.zip

2009-02-03 - Alvas.Audio

Tue, 3 Feb 2009 00:00:00 GMT

Alvas.Audio new version has been published.

New features:

RecordPlayer class for recording and playback.
WaveReadWriter, Mp3ReadWriter, RawReadWriter and IAudioReadWriter classes to read/write data from/to the audio stream.
MergeStereo methods for merging 2 audio mono into one stereo.
Doesn't use unsafe code.

2009-01-24 - Alvas.Audio

Sat, 24 Jan 2009 00:00:00 GMT

Due to high demand Alvas.Audio lifetime license with free updates for all of the following releases appeared.
For more details please see order page.

2009-01-23 - Alvas.Audio

Fri, 23 Jan 2009 00:00:00 GMT

Alvas.Audio for .Net code name "Anna" 61b1 beta has been released.

New features:

Dictophone class with record/play, forward/backward possibility.
AudioCompressionManager.MergeStereo methods for merges 2 mono streams to one stereo.
Much more.

Direct link: http://alvas.net/Download/Alvas.Audio.61b1.zip

2009-01-05 - Alvas.Labels

Mon, 5 Jan 2009 00:00:00 GMT

Alvas.Labels now can be used in any of your projects for free. Sources still cost money.

2008-12-04 - Alvas.Audio

Thu, 4 Dec 2008 00:00:00 GMT

Alvas.Audio new version has been published.

New features:

Added support for recording and playback in WAV format with 32 bits floating point format (WAVE_FORMAT_IEEE_FLOAT).
Added support for recording and playback in WAV format with 24 and 32 bits PCM format with more than two channels.
Can use PlayerEx and RecorderEx in the console applications and Windows Services.

2008-12-02 - Alvas.Audio

Tue, 2 Dec 2008 00:00:00 GMT

Enter coupon alvas-audio-2009 and get 35% discount on Alvas.Audio or Alvas.Suite! Valid till 1 January 2009.

2008-07-12 - Alvas.Audio

Fri, 11 Jul 2008 23:00:00 GMT

Alvas.Audio new version has been published.

New classes were added:

AcmConverter class converts audio data from one format to another.
AudioReader/AudioWriter are base classes for stream audio readers/writers.
Mp3Reader/Mp3Writer are classes for reading/writing audio data from/to MP3 streams.
AviReader is a class for reading audio data from Avi streams.
RawReader/RawWriter are classes for reading/writing audio data from/to headerless streams. Slinear, Gsm, A-law, mu-law etc.

2008-03-31 - Alvas.Audio

Sun, 30 Mar 2008 23:00:00 GMT

Alvas.Audio new version has been published.

New features:

Convert audio wave stream to mp3 stream
Convert Dialogic .vox (adpcm) stream to Mp3 stream
Insert and mix audio data into main audio data with specified offset multiple times
Split stereo audio stream to two mono streams
Reverse audio wave stream
Create audio format for MPEG Layer3 audio data
Sign library with strong name. Now audio library can be added to GAC

2007-12-01 - Alvas.Audio

Sat, 1 Dec 2007 00:00:00 GMT

Enter coupon alvas-audio-2008 and get 25% discount on Alvas.Audio! Valid till 31 December 2007.

2007-11-26 - Alvas.Audio

Mon, 26 Nov 2007 00:00:00 GMT

Alvas.Audio new version has been published.

New features:

Change the speed of audio data
Join several pieces of audio in a single
Cut a piece of the audio stream
Insert a piece in the audio stream
Remove a piece of the audio stream
Create audio format from the byte array

2007-06-06 - Alvas.Audio

Tue, 5 Jun 2007 23:00:00 GMT

Alvas.Audio new version has been published.

New features:

encode and decode Dialogic .vox (adpcm) format data;
play, record and convert RAW headerless format (SLINEAR etc);
change source line volume for recording;
change different volume for stereo mixer line;
change volume for PlayerEx.

2007-01-18 - Alvas.Audio

Thu, 18 Jan 2007 00:00:00 GMT

Alvas.Audio new version has been published.

New! Mixer controls set up:

select source line for recording;
change source line volume for recording;
additional controls adjustment. For example, "Mic Boost";
change master volume for playback;
playback muting.

2006-11-09 - Alvas.Audio

Thu, 9 Nov 2006 00:00:00 GMT

Alvas.Audio new version has been published.
Some new features were added:

Now PlayerEx can play mixed audio data.
PlayerEx can detect that playing process is complete.

Also some bugs were fixed.

2006-10-09 - Alvas.Audio

Sun, 8 Oct 2006 23:00:00 GMT

Alvas.Audio new version has been published.
Some new features were added:

To get the format list for specified WaveFormat.
To get audio stream duration in milliseconds.
To change Wave stream to MP3 stream if Wave stream contains 'MPEG Layer 3' data
To show the dialog box that enables the user to select the waveform-audio format.
To get the WaveFormat for specified format handle.
To get the format for the conversion from the specified format and specified format tag.
To get the format list for the conversion from the specified format.

2006-09-18 - Alvas.Audio

Sun, 17 Sep 2006 23:00:00 GMT

Alvas.Audio new version has been published.
New Features

Record audio data:
1. pause and resume recording;
2. get the current sound position;
Play audio data:
1. play uncompressed audio data (PCM);
2. play compressed audio data: IMA ADPCM, Microsoft ADPCM, CCITT A-Law, CCITT u-Law, GSM 6.10, MPEG Layer-3 (mp3) and others;
3. play data from the stream (file stream, memory stream);
4. pause and resume playing;
5. get the current sound position;
6. play data from any player installed in the system (multiple sound cards).
Convert the audio data from one to another audio format.
View the level of the input sound signal.

2006-07-02 - Alvas.FileControls

Sat, 1 Jul 2006 23:00:00 GMT

New version Alvas.FileControls: has been published.

New samples

for c# and vb.net developers.

2006-01-07 - Alvas.Audio

Sat, 7 Jan 2006 00:00:00 GMT

Alvas.Audio new version allow sound recording in PCM, IMA ADPCM, Microsoft ADPCM, CCITT A-Law, CCITT u-Law, GSM 6.10, MPEG Layer-3 (mp3) and other wave file format.

2006-01-07 - Alvas.FileControls

Sat, 7 Jan 2006 00:00:00 GMT

New version Alvas.FileControls: has been published.

New components

CDBurner is a component for burning writable CD.

2005-03-27 - Alvas.Audio

Sun, 27 Mar 2005 00:00:00 GMT

Alvas.Audio new version has been published. Some bug-fixes and improvements.

2005-01-05 - Alvas.FileControls

Wed, 5 Jan 2005 00:00:00 GMT

New version Alvas.FileControls: has been published.

New components

FileOperation - copies, moves, renames, or deletes a file system object.

2004-06-03 - Alvas.FileControls

Wed, 2 Jun 2004 23:00:00 GMT

New version Alvas.FileControls: has been published.

New components

DiskInfo - Shows information about the disk.
DragFile - allows specified control drag'n'drop files from Windows Explorer.
FileFind - allows finding files entire disk.
PathInfo - Shows information about the path.

2004-05-17 - Alvas.Suite

Sun, 16 May 2004 23:00:00 GMT

Now Alvas.Suite - components set, which includes:

Alvas.FileControls
Alvas.ShapeForms
Alvas.Controls
Alvas.Scriptor
Alvas.Labels
and Alvas.Audio

2004-04-04 - Alvas.Audio

Sat, 3 Apr 2004 23:00:00 GMT

Alvas.Net is happy to announce a new product for .Net:
Alvas.Audio - components collection that allows Your applications to play and record sound.

2003-12-01 - Alvas.Suite

Mon, 1 Dec 2003 00:00:00 GMT

Alvas.Net is glad to introduce Alvas.Suite - components set, which includes:

Alvas.FileControls
Alvas.ShapeForms
Alvas.Controls
Alvas.Scriptor
Alvas.Labels

2003-11-24 - Alvas.Scriptor

Mon, 24 Nov 2003 00:00:00 GMT

Alvas.Net is glad to introduce Alvas.Scriptor - components set, which adds scripting possibility to Your applications. It allows creating adaptable applications with easy changeable logic and interface.
Components can be used in Windows.Forms, ASP.NET and Webservices.
Scripts can be written in all main .Net programming languages: c#, VB.Net, JScipt.Net, J#. Scripts code can be divided to some modules. Scripts code can be storaged in memory, files, database etc.
You can define Your own classes, create objects and assign event handlers.

2003-11-18 - Alvas.FileControls

Tue, 18 Nov 2003 00:00:00 GMT

New version Alvas.FileControls: has been published.

New features and improvements

ExplorerListView.FileExecuted event to allow execute files or not by double click.
ExplorerListView.Mask property for limits which files are displayed in the file list view.
FilterComboBox.ExplorerList property to links the filter combo box to an explorer list view control.

2003-11-17 - Alvas.ShapeForms

Mon, 17 Nov 2003 00:00:00 GMT

New version Alvas.ShapeForms has been published. Some bug-fixes and improvements.

2003-05-19 - Alvas.Controls

Sun, 18 May 2003 23:00:00 GMT

Alvas.Net is happy to announce a new product for .Net:
Alvas.Controls - collection that allows developers to create high quality professional applications with cool design.