Stefano Guidoni : winemp3: Fixed mpeg3_streamsize.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 21186d5a69a4d1f787edfe92ad26d4a7a964651a
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=21186d5a69a4d1f787edfe92ad26d4a7a964651a

Author: Stefano Guidoni <s.guidoni at tin.it>
Date:   Tue Mar 24 20:52:54 2009 +0100

winemp3: Fixed mpeg3_streamsize.

mpeg3_streamsize must estimate the number of samples of an mp3 chunk. 
The result must be block aligned (PCM) or frame aligned (MP3).

---

 dlls/winemp3.acm/mpegl3.c |   28 ++++++++++++++++++++--------
 1 files changed, 20 insertions(+), 8 deletions(-)

diff --git a/dlls/winemp3.acm/mpegl3.c b/dlls/winemp3.acm/mpegl3.c
index 6d476e4..e0f0ebd 100644
--- a/dlls/winemp3.acm/mpegl3.c
+++ b/dlls/winemp3.acm/mpegl3.c
@@ -471,6 +471,8 @@ static	LRESULT	MPEG3_StreamClose(PACMDRVSTREAMINSTANCE adsi)
  */
 static	LRESULT MPEG3_StreamSize(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMSIZE adss)
 {
+    DWORD nblocks;
+
     switch (adss->fdwSize)
     {
     case ACM_STREAMSIZEF_DESTINATION:
@@ -478,14 +480,19 @@ static	LRESULT MPEG3_StreamSize(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMSIZE ad
 	if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
 	    adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MPEGLAYER3)
         {
-	    /* don't take block overhead into account, doesn't matter too much */
-	    adss->cbSrcLength = adss->cbDstLength * 12;
+            nblocks = (adsi->pwfxDst->nAvgBytesPerSec * 8 * 144 / adsi->pwfxDst->nSamplesPerSec);
+            nblocks = (adss->cbDstLength - 3002 - nblocks) / nblocks;
+            if (nblocks == 0)
+                return ACMERR_NOTPOSSIBLE;
+            adss->cbSrcLength = nblocks * 1152 * adsi->pwfxSrc->nBlockAlign;
 	}
         else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MPEGLAYER3 &&
                  adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
         {
-	    FIXME("misses the block header overhead\n");
-	    adss->cbSrcLength = 256 + adss->cbDstLength / 12;
+            nblocks = adss->cbDstLength / (adsi->pwfxDst->nBlockAlign * 1152);
+            if (nblocks == 0)
+                return ACMERR_NOTPOSSIBLE;
+            adss->cbSrcLength = nblocks * (DWORD)(adsi->pwfxSrc->nAvgBytesPerSec * 8 * 144 / adsi->pwfxSrc->nSamplesPerSec);
 	}
         else
         {
@@ -497,14 +504,19 @@ static	LRESULT MPEG3_StreamSize(PACMDRVSTREAMINSTANCE adsi, PACMDRVSTREAMSIZE ad
 	if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_PCM &&
 	    adsi->pwfxDst->wFormatTag == WAVE_FORMAT_MPEGLAYER3)
         {
-	    FIXME("misses the block header overhead\n");
-	    adss->cbDstLength = 256 + adss->cbSrcLength / 12;
+            nblocks = adss->cbSrcLength / (adsi->pwfxSrc->nBlockAlign * 1152);
+            if (nblocks == 0)
+                return ACMERR_NOTPOSSIBLE;
+            adss->cbDstLength = nblocks * (DWORD)(adsi->pwfxDst->nAvgBytesPerSec * 8 * 144 / adsi->pwfxDst->nSamplesPerSec);
 	}
         else if (adsi->pwfxSrc->wFormatTag == WAVE_FORMAT_MPEGLAYER3 &&
                  adsi->pwfxDst->wFormatTag == WAVE_FORMAT_PCM)
         {
-	    /* don't take block overhead into account, doesn't matter too much */
-	    adss->cbDstLength = adss->cbSrcLength * 12;
+            nblocks = (adsi->pwfxSrc->nAvgBytesPerSec * 8 * 144 / adsi->pwfxSrc->nSamplesPerSec);
+            nblocks = (adss->cbSrcLength - 3002 - nblocks) / nblocks;
+            if (nblocks == 0)
+                return ACMERR_NOTPOSSIBLE;
+            adss->cbDstLength = nblocks * 1152 * adsi->pwfxDst->nBlockAlign;
 	}
         else
         {