Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

waveOutWrite()

Posted on 2004-04-09
4
Medium Priority
?
842 Views
Last Modified: 2012-06-21
Hi.
I am trying to stream audio with waveOutWrite(). I have a server which gets continuously packets with voice data. What I do is playing data with waveOutWrite() and then in callback function when the playing is done I call to waveOutWrite() with next packet (there is no such situation that there are no ready packets). The problem is that because of a very small size of packets and so a large amount of packets there is a small gap between them, so I dont get a clear playing. How can I stream it more smoothly?
0
Comment
Question by:Buffon
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 22

Expert Comment

by:grg99
ID: 10792226
You have to buffer up a second or so of data before you start playing.  That way you will always have a buffer full of sound to play when the current sound finishes.

You need some code like:

SecsPerBuffer := BufferSize / BytesPerSecondPlaybackRate;
WantedBacklog :=  1;  // seconds

NeedBuffers := WantedBacklog / SecsPerBuffer;

HaveBuffers := 0;

While HaveBuffers < NeedBuffers do ReadNextBuffer;

QueueUpFirstBuffer;

----------------

You can also add another level of queuing by sending out with waveoutwrite one orr more buffers more than the current one.
That way your callback doesnt have to run at the highest priority in order to bring up the next buffer.



0
 
LVL 11

Author Comment

by:Buffon
ID: 10796395
Hi.
As I said I have no problem with buffering. But thanks anyway, I already found a solution:
http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=4422&lngWId=3
0
 
LVL 1

Accepted Solution

by:
GhostMod earned 0 total points
ID: 10823957
PAQd, 250 points refunded.

GhostMod
Community Support Moderator
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article is the first in a series of articles about the C/C++ Visual Studio Express debugger.  It provides a quick start guide in using the debugger. Part 2 focuses on additional topics in breakpoints.  Lastly, Part 3 focuses on th…
This article will show you some of the more useful Standard Template Library (STL) algorithms through the use of working examples.  You will learn about how these algorithms fit into the STL architecture, how they work with STL containers, and why t…
The viewer will learn additional member functions of the vector class. Specifically, the capacity and swap member functions will be introduced.
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

704 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question