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Do I need to deal with Audio Units when I need custom audio effects or can I rely on Audio Queue Services?
by soonk in Operating Systems

From my understanding Audio Queue Services are a higher level API than Audio Units, which use Audio Units. OpenAL also uses Audio Units. So Audio Units is the lowest level audio API in iOS.

I need to record a sound and then apply a custom filter to the audio stream and play it back. Audio Queue Services seem to be good for recording, and they can also be used to play it back. But I'

Difference Between Coaxal Audio Optical Digital Audio & HDMI 1.3 Audio
by okhomenko in Electronics
Modern home theater systems offer a variety of methods for transmitting high-quality digital surround sound from source components such as Blu-ray and DVD to processors and receivers. The most commonly used among these are High Definition Multimedia Interface, or HDMI, digital coaxial and optical, formally known as Toslink. Of these, some are necessary for certain surround formats, and contain oth

convert audio file caf to mp3,.wav,.aac,.amr.ac-3,WAV Audio,WebM audio programmatically
by IndyColtsFan in Mobile Programming

I am using audio streaming server that is capable of handling of mp3,.wav,.aac,.amr.ac-3,WAV Audio files.
I want to convert .caf file to any one of these format programmatically.

please help.

Thank you.

Can I decrypt an audio stream using audio units or audio queues? (iOS)
by KeithTalent in Operating Systems

I have an audio file which has been broken into chunks of size let's say 10kb, the chunks encrypted. I can't have a whole unencrypted file on disk, so to play it, I'll need to stream it from disk, i.e. I'll have to read in each 10kb chunk, decrypt the chunk, and play it back.

Is it possible to do this using audio queues or audio units? Which is the better choice, and what would

iOS Mixing audio, Audio Toolbox vs Audio Units
by Guilherme Costa in Mobile Programming

I've been searching for a while and can't come to a good conclusion.

I am trying to create an app that can "record" beats that a user makes on a 4x4 button array. Each button has a sound tied to it and after they hit record, I want to mix the audio that gets played and save it to a file so they can listen to it and play over it later.

What makes this even trickier is

How to embed video/audio from a video/audio streaming website from a user specified video/audio URL?
by David Marchant in Programming Languages

I am running a discussion website where people discuss on various topics. Some user of my website gave me a suggestion to add a feature where they can provide a video URL and the video will embed at the place where they provided the URL in the discussion topic. I can do that for YouTube. But is there any common way available by which users of my website embed video from other video streaming we

Audio Graph render callback stops being called after audio session interruption
by Iceland in Operating Systems

I am using Audio Unit Processing Graph Services on iOS to create a small graph of audio units to output audio. I set a render callback, and feed audio data into the graph when the callback is called.

This works fine until my audio session is interrupted (e.g by a phone call or alarm); at that point the callback stops, and never is called again, even after the interruption finishes.<

How to set the buffer length to match audio sampling inputs of Custom Audio Codec?
by jasonmoo in Programming Languages

I have been trying marriage JSpeex as JMF codec plugin. It was successfully installed and is usable. However, issue comes in with the input buffer size of the 'Codec' interface method

void process(Buffer input, Buffer output);

I'm using narrow band mode for JSpeex, with input audio format

public static final AudioFormat LINEAR_8HZ_16B_MO_LE_S

How can I reuse the audio a browser already downloaded so it doesn't download it again in other pages that use the same audio file?
by The_Eclectic1 in Web Design

I'm making an audio heavy page. I'm using the JavaScript audio element. The code looks like this:


var x = new Audio("x.mp3");
var y = new Audio("y.mp3");
var z = new Audio("z.mp3");
function playMe(n){


<button class="button" onclick="playMe(x)")>Play</button>

problem while inserting audio file in MediaStore.Audio.Media.EXTERNAL_CONTENT_URI in android
by Jorgemr in Android

my code is like this

ContentValues values = new ContentValues();

values.put(MediaStore.Audio.Media._ID, _ID);
values.put(MediaStore.Audio.Media.DATA, DATA);
values.put(MediaStore.Audio.Media.DISPLAY_NAME, DISPLAY_NAME);
values.put(MediaStore.Audio.Media.SIZE, SIZE);
values.put(MediaStore.Audio.Media.MIME_TYPE, MI

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