quartz: Fix frame length calculation for MPEG audio.

037cefc4 · Chris Robinson · Alexandre Julliard · b2e3e2e9 · 037cefc4
Commit 037cefc4 authored Jun 23, 2012 by Chris Robinson Committed by Alexandre Julliard Jun 25, 2012
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Showing with 9 additions and 3 deletions

mpegsplit.c dlls/quartz/mpegsplit.c +9 -3

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--- a/dlls/quartz/mpegsplit.c
+++ b/dlls/quartz/mpegsplit.c
@@ -154,11 +154,17 @@ static HRESULT parse_header(BYTE *header, LONGLONG *plen, LONGLONG *pduration)
        return E_INVALIDARG;
    }

-
-    if (layer == 3 || layer == 2)
+    if (layer == 1)
+        length = 4 * (12 * bitrate / freqs[freq_index] + padding);
+    else if (layer == 2)
        length = 144 * bitrate / freqs[freq_index] + padding;
+    else if (layer == 3)
+        length = 144 * bitrate / (freqs[freq_index]<<lsf) + padding;
    else
-        length = 4 * (12 * bitrate / freqs[freq_index] + padding);
+    {
+        ERR("Impossible layer %d\n", layer);
+        return E_INVALIDARG;
+    }

    duration = (ULONGLONG)10000000 * (ULONGLONG)(length) / (ULONGLONG)(bitrate/8);
    *plen = length;