[wdmaudiodev] Re: Blocky looking metering in SoundForge
- From: Waldemar Haszlakiewicz <waldemar.haszlakiewicz@xxxxxxxx>
- To: wade <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 13 Nov 2003 16:26:05 +0100
You can transfer smaller chunks and everything will still work.
In our driver we copy the driver buffer size chunk (chunk size: 64 samples,
128, 256,...)
and advance the stream pointer everything else is done by the ks driver.
//Advance buffer.
if ( pChannelInfo->type == CHANNEL_TYPE_OUT )
{
KsStreamPointerAdvanceOffsetsAndUnlock(
streamPointer,
advanceOffset_bytes,
0,
FALSE
);
}
else
{
KsStreamPointerAdvanceOffsetsAndUnlock(
streamPointer,
0,
advanceOffset_bytes,
FALSE
);
}
All your increase stuff is useless it's done by the
KsStreamPointerAdvanceOffsetsAndUnlock procedure
and more it's probably even faulty( StreamPointer -> StreamHeader -> DataUsed
+= TransferSize;).
Waldemar
w> I have written an AVStreams capture driver.
w> I am experiencing a clunky, blocky display in audio applications that
provide visual metering of the audio signal. Upon closer inspection, in
Soundforge, If I set the "Status Format" to
w> "samples", and record, the "time recorded" field on the record window
increments by ~12k samples (48kBytes). Other audio cards increment by MUCH
smaller amounts. I notice that
w> 12k*2channels*2bytes is about one AVSream queue's worth of data (6 * 8192k
frames).
w> I am KsEditing the Allocator structure to allow selection of frame size, but
in this instance, 6, 8k frames were alloc'd.
w> I am completing the frames with the following code:
w> .... transfer the data to the StreamPointerBuffer
w> StreamPointer -> StreamHeader -> DataUsed += TransferSize;
w> Pin->audioPosition.WriteOffset += TransferSize;
w> // Now figure the duration
w> StreamPointer -> StreamHeader ->OptionsFlags =
(KSSTREAM_HEADER_OPTIONSF_DURATIONVALID);
w> StreamPointer -> StreamHeader->PresentationTime.Numerator =
Pin->kstimeNumer;
w> StreamPointer -> StreamHeader->PresentationTime.Denominator =
Pin->kstimeDenom;
w> StreamPointer -> StreamHeader->Duration = (TransferSize);
w> if (STATUS_DEVICE_NOT_READY == (status=KsStreamPointerAdvanceOffsets
(StreamPointer,0,StreamPointer->OffsetOut.Remaining,FALSE)))
w> {
w> status = STATUS_PENDING;
w> }
w> else
w> {
w> status = STATUS_SUCCESS;
w> // KsStreamPointerUnlock(StreamPointer,FALSE/*(!Pin->streamRunning)*/);
w> }
w> .
w> .
w> .
w> break;
w> return status;
w> Any ideas?
w> ---------------------------------
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