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gst/law/mulaw-conversion.c: Fix overflow bug in ulaw encoding.

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Original commit message from CVS:
* gst/law/mulaw-conversion.c: (mulaw_encode):
Fix overflow bug in ulaw encoding.
This commit is contained in:
Wim Taymans 2004-05-19 20:04:10 +00:00
parent 625ec784c3
commit b7d2e0b236
2 changed files with 12 additions and 3 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2004-05-19 Wim Taymans <wim@fluendo.com>
* gst/law/mulaw-conversion.c: (mulaw_encode):
Fix overflow bug in ulaw encoding.
2004-05-19 Benjamin Otte <in7y118@public.uni-hamburg.de>
* ext/mad/gstmad.c: (gst_mad_handle_event):

10
gst/law/mulaw-conversion.c
View file

@ -25,7 +25,7 @@
#include <glib.h>
#define ZEROTRAP /* turn on the trap as per the MIL-STD */
/* #define ZEROTRAP *//* turn on the trap as per the MIL-STD */
#define BIAS 0x84 /* define the add-in bias for 16 bit samples */
#define CLIP 32635
@ -57,10 +57,14 @@ mulaw_encode (gint16 * in, guint8 * out, gint numsamples)
sample = in[i];
/** get the sample into sign-magnitude **/
sign = (sample >> 8) & 0x80; /* set aside the sign */
if (sign != 0)
if (sign != 0) {
sample = -sample; /* get magnitude */
if (sample > CLIP)
}
/* sample can be zero because we can overflow in the inversion,
* checking against the unsigned version solves this */
if (((guint16) sample) > CLIP)
sample = CLIP; /* clip the magnitude */
/** convert from 16 bit linear to ulaw **/
sample = sample + BIAS;
exponent = exp_lut[(sample >> 7) & 0xFF];