0000871: unix sound plugin produces sharp noise under certain conditions.

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Category

Severity

Reproducibility

Date Submitted

Last Update

0000871

[Squeak] Sound

major

always

02-09-05 01:46

04-28-05 19:32

Reporter

johnmci

View Status

public

Assigned To

Priority

normal

Resolution

open

Platform

Status

assigned

Projection

none

OS Version

ETA

none

Fixed in Version

Product Version

3.9

Product Build

Summary

0000871: unix sound plugin produces sharp noise under certain conditions.

Description

I compiled sqUnixSoundMacOSX.c under the carbon VM and shipped as mac vm 3.8.6b5. Bert reported a problem of a sharp loud noise at various times. If for example draging an item out of the toolbox, then back in and hold the cursor down for extended periods while doing this. Dropping the item back in the toolbox does result in a beep (as expected).

Steps To Reproduce

Additional Information

The Problem code is

static OSStatus bufferDataProc(AudioConverterRef inAudioConverter, UInt32 *ioDataSize, void **outData, void *context)
{
  Stream *s= (Stream *)context;
  Buffer *b= s->buffer;
  char *p1, *p2;
  int n1, n2;
  Buffer_getOutputPointers(b, &p1, &n1, &p2, &n2);
  if (!n1)
    {
      static char empty[256];
      *ioDataSize= min(256, *ioDataSize);
      *outData= (void *)empty;
# if (DEBUG)
      putchar('-'); fflush(stdout);
# endif
    }

where you attempt to pass back an address to a local storage area (perhaps on the stack) that is not been initialized to zero. This then is processed by coreaudio resulting in a loud unwanted sound.

Attached Files

Relationships

Notes
(0001141 - 511 - 747 - 747 - 747 - 747 - 747) johnmci 02-09-05 01:54	I'l will note I would like to assign to Ian, but he's not listed as a person in Mantis. One solution would be to create a file variable (static) assign the first element to zero, the C standards say the other 255 elements will get filled with 0. The use that variable when passing back zeros to process. char empty[256] = { 0 }; if (!n1) { ioDataSize= min(256, ioDataSize); outData= (void )empty; # if (DEBUG) putchar('-'); fflush(stdout); # endif }

Issue History
Date Modified	Username	Field	Change
02-09-05 01:46	johnmci	New Issue
02-09-05 01:50	johnmci	Additional Information Updated
02-09-05 01:54	johnmci	Note Added: 0001141
02-09-05 01:54	johnmci	Assigned To	=> andreas
02-09-05 01:54	johnmci	Status	new => assigned
02-09-05 01:54	johnmci	Additional Information Updated
04-28-05 19:32	andreas	Assigned To	andreas =>

Mantis 1.0.8[^]

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