My question is simple,
I would like to do this :
http://www.codeproject.com/Articles/19854/Sending-and-playing-microphone-audio-over-network
But with another codec , in MP3.
Its possible with a free SDK/tools ... ?
Thanks
I would probably use the NAudio library and send the buffer with sockets (which should be easy since they're both a byte array).
I can't expend too much because NAudio and sockets are 2 complete subjects.
But I can provide links:
NAudio
Any information you'd probably need + download can be found here
The videos in this user is a nice series that explains NAudio
Sockets - pretty hard subject for me so I'll give more links
http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.aspxhttp://www.codeguru.com/csharp/csharp/cs_misc/sampleprograms/article.php/c7695/Asynchronous-Socket-Programming-in-C-Part-I.htm
http://www.csharp-examples.net/socket-send-receive/
http://www.codeproject.com/Articles/5252/Sockets-in-C
http://www.developerfusion.com/article/3918/socket-programming-in-c-part-1/
http://www.codeguru.com/csharp/csharp/cs_misc/sampleprograms/article.php/c7695/Asynchronous-Socket-Programming-in-C-Part-I.htm
http://csharp.net-informations.com/communications/csharp-socket-programming.htm
Don't forget to use Google!
Once you have basic understanding read my first sentence (with the buffer) and it will be clear.
P.S. NAudio might need another .dll to handle mp3, not sure, but it shouldn't be hard to find.
VLC Media Player can stream in a variety of different formats, including Icecast. I have not used them myself, but it looks like a nice starting point.
Related
I'm writing a program which at some point downloads an MP3 and stores it into a byte array. Then I create Stream from the bytes.
Not sure how to play the Stream. I don't want to use any dlls except for DirectSound.
Are there any better ways to play the Stream? (not another dll)
If yes, how? And if not, how to play the Stream by DirectSound?
It seems that this is not possible. See the quote from a similar MSDN forum post:
Raw DirectSound isn't capable of playing mp3-compressed audio. I recommend using DirectShow for this purpose, as it supports a wide variety of formats. You could also use a streaming dsound buffer and do the decompression yourself, but this is probably overkill in your situation.
Note that I don't recommend using mp3 in your project in any case, since it is not a royalty-free format. Ogg Vorbis is a good alternative.
Mp3 not royalty free so you will struggle to do it without a 3rd party lib and even so it is not recommended.
I’m making an audio synthesizer and I’m having issues figuring out what to use for audio playback. I’m using physics and math to calculate the source waveforms and then need to feed that waveform to something which can play it as sound. I need something that can 1) play the waveforms I calculate and 2) play multiple sounds simultaneously (like holding one key down on a piano while pressing other keys). I’ve done a fair bit of research into this and I can’t find something that does both of those things. As far as I know, I have 5 potential options:
DirectSound. It can take a waveform (a short[]) as a parameter and play it as sound, and can play multiple sounds simultaneously. But it won’t work with .NET 4.5.
System.Media.SoundPlayer. It works with .NET 4.5 and has better quality audio than Direct Sound, but it has to play sound from a .wav file and cannot play multiple sounds at once (nor can multiple instances of SoundPlayer). I ‘trick’ SoundPlayer into working by translating my waveform into .wav format in memory and then send SoundPlayer a MemoryStream of the in-memory .wav file. Could I potentially achieve control over the playback by altering the stream? I cannot append bytes to the stream (I tried) but I could potentially make the stream an arbitrary size and just re-write all the bytes in the stream with the next segment of audio data every time the end of the stream is reached.
System.Windows.Controls.MediaElement. I have not experimented with this yet, but from MSDNs documentation I don’t see a way to send it a waveform in memory without saving it to disk first and then reading it; I don’t think I can send it a stream.
System.Windows.Controls.MediaPlayer. I have not experimented with this either, but the documentation says it’s meant to be used as a companion to some kind of animation. I could potentially use this without doing any real (user-perceivable) animation to achieve my desired effect.
An open source solution. I’m hesitant to use an open source solution as I find they are typically poorly documented and not very maintainable, but I am open to ideas if there is one out there that is well documented and can do what I need.
Can anyone offer me any guidance on this or how to create flexible audio playback?
http://naudio.codeplex.com , without a doubt. Mark is a regular here on SO, the product is well alive, there are good code examples.
It works. We built some great stuff with it.
I have a video server streaming MPEG-4(video/audio)
I need to get the audio from the MPEG-4...is it possible to get only the audio???
I would like to have some tutorials, samples, examples or something useful to start
programming my application.
I found this : Bass.Net to stream audio, but I don't know if it supports RTSP, and I would like to know if someone has any tutorial or something useful.
You can get the individual packets using my library and do something with them.
You can also aggregate the source using my library.
The library is # http://net7mma.codeplex.com/
There is an article # CodeProject http://www.codeproject.com/Articles/507218/Managed-Media-Aggregation-using-Rtsp-and-Rtp which explains how it works.
If you need anything else let me know!
I am looking to create an application that will allow me to record from my mic and playback the recording through other pc's. At this point however I would just like it to play back on my own computer so I can get it working.
I have been looking at NAudio for the past few hours and it seems like it may be able to help me achieve this goal.
I am just wondering if anyone else has had any experience with this and if it is at all possible?
Thanks,
Stuart
There is an example project on codeproject doing this:
http://www.codeproject.com/KB/cs/Streaming_wave_audio.aspx
I don't know how low the latency is.
As a codec I'd recommend Speex(at least for speech). It's free, open source and offers low latency and low bandwidth.
Bass Audio Library is another solid option worth looking into.
It is possible to do, but you are unlikely to get low latency with WaveIn/WaveOut (possibly better results with WASAPI). You could use the BufferedWaveProvider (in the latest source code) to store up the audio being recorded from the microphone and supplying the output to soundcard.
NAudio is great as a starting point for audio capture and playback but as Mark pointed out the latency might be an issue.
If you take the next step and want to sent the audio data across the network you will need a codec to compress the data as PCM or WAV are uncompressed and for voice you only need a small part of the bandwidth needed for WAV.
As you are working with C# there is a C# port of Speex available, called NSpeex, which might be worth having a look at..
I'm looking to develop a Silverlight application which will take a stream of data (not an audio stream as such) from a web server.
The data stream would then be manipulated to give audio of a certain format (G.711 a-Law for example) which would then be converted into PCM so that additional effects can be applied (such as boosting the volume).
I'm OK up to this point. I've got my data, converted the G.711 into PCM but my problem is being able to output this PCM audio to the sound card.
I basing a solution on some C# code intended for a .Net application but in Silverlight there is a problem with trying to take a copy of a delegate (function pointer) which will be the topic of a separate question once I've produced a simple code sample.
So, the question is... How can I output the PCM audio that I have held in a data structure (currently an array) in my Silverlight to the user? (Please don't say write the byte values to a text box)
If it were a MP3 or WMA file I would play it using a MediaElement but I don't want to have to make it into a file as this would put a crimp on applying dynamic effects to the audio.
I've seen a few posts from people saying low level audio support is poor/non-existant in Silverlight so I'm open to any suggestions/ideas people may have.
The simple answer is that there is no support for PCM playback from Silverlight in version 2. So unless you want to write a fully managed PCM to MP3 converter you are stuck. Even then I'm not sure you could get the MediaElement to play from isolated storage.
Is there any chance you could use a web service to perform the conversion?
See also this question:
Where's the sound API in Silverlight? Or, how do I write a music app to run in the browser?
Update: Silverlight 3 supports your custom audio sources. However, it won't let you intercept samples to perform effects on WMA or MP3, presumably for DRM reasons, so you would still potentially need to write your own decoder.
Short answer is use a MediaElement + a MediaStreamSource
Check out these:
http://blogs.msdn.com/gillesk/archive/2009/03/23/playing-back-wave-files-in-silverlight.aspx
http://code.msdn.microsoft.com/wavmss/Release/ProjectReleases.aspx?ReleaseId=2417
Basically, write a decoder in managed code to convert G.711 a-Law to PCM, then do whatever modifications you want to the raw values, then pass those into a MediaStreamSource.
Looks like Silverlight 3 supports direct PCM output now, or will when released. I don't see anything in the docs about the raw AV pipeline yet.
Mark Heath's answer is correct - only certain formats are supported - mp3 and certain flavours of WMA (unfortunately not WMA lossless which would be 'closer' to PCM).
To play PCM data in Silverlight, you could do the following:
* Convert the PCM into mp3 data, and store it in memory.
* Play the mp3 data using the technique presented at ManagedMediaHelpers. The idea here involves a class called Mp3MediaStreamSource (derived from System.Windows.Media.MediaStreamSource) that provides mp3 chunks to a MediaElement to play. The chunks will need to be in a stream, but of course a memory stream will do.
I initially thought you might be able to provide PCM chunks via MediaStreamSource, but this does not work. It's a real shame as it would solve your problem (and the one I was facing - making a Speex audio file player) really easily!