[Bug 11659] New: acmStreamConvert inconsistencies ( Windows Vs Wine for mp3 -> pcm)

http://bugs.winehq.org/show_bug.cgi?id=11659

Summary: acmStreamConvert inconsistencies (Windows Vs Wine for
                    mp3 -> pcm)
           Product: Wine
           Version: 0.9.55.
          Platform: PC-x86-64
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: msacm32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

When attempting to convert MP3 to PCM (Stereo, 44100Hz, 16bit - for burning to
a disc) the acmStreamConvert function (working synchronously) does not work as
expected (doesn't do what Windows does).

The 'cbSrcLengthUsed' value within the ACMSTREAMHEADER structure is not updated
with the correct value (or the wrong amount of data is actually used).

When 'cbSrcLength' and 'cbDestLength' are set to the same value (in my case,
75264), after conversion 'cbSrcLengthUsed' is always being set to the entire
size of the source buffer (75264) rather than the amount of the source buffer
that was actually used to create the content in the destination buffer.

Windows behaviour on first two calls to acmStreamConvert...

D 10:41:06 FileSize: 5339011
D 10:41:06 CurrentFileBytesRead: 75264
D 10:41:06 cbSrcLength: 75264
D 10:41:06 cbSrcLengthUsed: 16343
D 10:41:06 cbDstLength: 75264
D 10:41:06 cbDstLengthUsed: 73728

D 10:41:06 FileSize: 5339011
D 10:41:06 CurrentFileBytesRead: 91607
D 10:41:06 cbSrcLength: 75264
D 10:41:06 cbSrcLengthUsed: 10031
D 10:41:06 cbDstLength: 75264
D 10:41:06 cbDstLengthUsed: 73728

Wine behaviour on first two calls to acmStreamConvert...

D 10:33:22 FileSize: 5339011
D 10:33:22 CurrentFileBytesRead: 75264
D 10:33:22 cbSrcLength: 75264
D 10:33:22 cbSrcLengthUsed: 75264
D 10:33:22 cbDstLength: 75264
D 10:33:22 cbDstLengthUsed: 73728

D 10:33:22 FileSize: 5339011
D 10:33:22 CurrentFileBytesRead: 150528
D 10:33:22 cbSrcLength: 75264
D 10:33:22 cbSrcLengthUsed: 75264
D 10:33:22 cbDstLength: 75264
D 10:33:22 cbDstLengthUsed: 73728

Applications are supposed to move the source buffer on by 'cbSrcLengthUsed'
bytes after each call to acmStreamConvert.

The source buffer is therefore being used up far too quickly and the conversion
is considered complete long before it actually is.