🚀 go-pugleaf

On Mon, 16 Apr 2001 10:43:47 +0200, Mike <ppagee@yahoo.com> wrote:

>How can I record with waveIn without skipping (now I record to buffer,
>than, when all data arrives, save to disk, and again start recording,
>but
>I lost a little of sound)?

As with playing, you need to use double-buffering so that when one
buffer becomes full the other begins to fill while you process the
first one. The procedure works like this:

- Queue buffer A
- Queue buffer B
- Start recording
- A fills: process data in A and requeue it
- B fills: process data in B and requeue it
- A fills: etc.

You never leave the device without a queued buffer to place data into.
Size the buffers so that each holds a second or so of data.

Hi!

So, when message MMWimData comes I should with
WaveRecordBegin(hwi, lpWaveHdrR2); (where is lpWaveHdrR2
second buffer) start recording into second buffer. And when
that buffer is filled start recording to first buffer.

But won't there be any gap?


Mike

On Tue, 17 Apr 2001 14:45:07 +0200, Mike <ppagee@yahoo.com> wrote:

>So, when message MMWimData comes I should with
>WaveRecordBegin(hwi, lpWaveHdrR2); (where is lpWaveHdrR2
>second buffer) start recording into second buffer. And when
>that buffer is filled start recording to first buffer.

No, buffer two should be queued _before_ the first buffer is returned
to you. If you look at my previous msg you'll see that the process is
begun by queueing both buffers.

Imagine that the incoming data is a stream of water flowing out of a
tap, and you have two buckets to transfer it. The way to catch all the
water is to always have a bucket ready below when the top one fills.
Try it in your kitchen sink with two cups to get the idea :-)

Hi!

And how can I "put the other cup under"? With making header?

So, it should be something like this:
making header1
making header2
start recording 1
And what now? Start recording 2 or wait until recording 2 is finished?


Mike

"Mike" <ppagee@yahoo.com> wrote in message
news:3ADAB0C3.35E942DC@yahoo.com...
>
> How can I record with waveIn without skipping (now I record to buffer,
> than, when all data arrives, save to disk, and again start recording,
> but
> I lost a little of sound)?

Are you using MCI?

Bill

On Tue, 17 Apr 2001 22:08:07 +0200, Mike <ppagee@yahoo.com> wrote:

>So, it should be something like this:
>making header1
>making header2
>start recording 1
>And what now? Start recording 2 or wait until recording 2 is finished?

When I refer to queueing a buffer, that means calling
waveInAddBuffer(). The fact that you must call waveInPrepareHeader()
first is just a procedural detail.

Hi!

> Are you using MCI?

No, I don't.


Mike

Hi!

So:
waveInPrepareHeader (1)
waveInPrepareHeader (2)
waveInAddBuffer (1)
waveInAddBuffer (2)
waveInStart

OK, how can i now know which buffer is full? And what do next?


Mike

On Thu, 19 Apr 2001 18:00:31 +0200, Mike <ppagee@yahoo.com> wrote:

>waveInPrepareHeader (1)
>waveInPrepareHeader (2)
>waveInAddBuffer (1)
>waveInAddBuffer (2)
>waveInStart

You got it!

>OK, how can i now know which buffer is full?

Without looking it up, I'm sure all the notification mechanisms
(message, callback etc) enable you to find out - you may need to fill
in a header "tag" of some kind. But you don't really need to know,
because the buffers always fill alternately, beginning with #1.

> And what do next?

Fetch the data from the filled buffer and re-queue it immediately. In
the meantime the other buffer is starting to fill.

Hi!

Just thanks for everything! It works now.


Mike

On Fri, 20 Apr 2001 19:49:21 +0200, Mike <ppagee@yahoo.com> wrote:

>Just thanks for everything! It works now.

Great. I could have given you some sample code, but you actually
understand it now :-)