bt
#0  0x0813b1a6 in af_calc_insize_constrained ()
#1  0x080d7a5b in decode_audio ()
#2  0x0807557e in main ()
#3  0x406040bf in __libc_start_main () from /lib/libc.so.6
(gdb) disass $pc-32 $pc+32
Dump of assembler code from 0x813b186 to 0x813b1c6:
0x813b186 <af_calc_insize_constrained+14>:	sbb    $0xf,%al
0x813b188 <af_calc_insize_constrained+16>:	scas   %es:(%edi),%eax
0x813b189 <af_calc_insize_constrained+17>:	
    jo     0x813b19f <af_calc_insize_constrained+39>
0x813b18b <af_calc_insize_constrained+19>:	mov    (%eax),%eax
0x813b18d <af_calc_insize_constrained+21>:	movl   $0x1,0xfffffff8(%ebp)
0x813b194 <af_calc_insize_constrained+28>:	movl   $0x1,0xfffffffc(%ebp)
0x813b19b <af_calc_insize_constrained+35>:	nop    
0x813b19c <af_calc_insize_constrained+36>:	lea    0x0(%esi,1),%esi
0x813b1a0 <af_calc_insize_constrained+40>:	mov    0xfffffff8(%ebp),%edi
0x813b1a3 <af_calc_insize_constrained+43>:	mov    0xfffffffc(%ebp),%ebx
0x813b1a6 <af_calc_insize_constrained+46>:	imul   0x28(%eax),%edi
0x813b1aa <af_calc_insize_constrained+50>:	mov    %edi,0xfffffff8(%ebp)
0x813b1ad <af_calc_insize_constrained+53>:	imul   0x2c(%eax),%ebx
0x813b1b1 <af_calc_insize_constrained+57>:	mov    %ebx,0xfffffffc(%ebp)
0x813b1b4 <af_calc_insize_constrained+60>:	mov    0x18(%eax),%eax
0x813b1b7 <af_calc_insize_constrained+63>:	test   %eax,%eax
0x813b1b9 <af_calc_insize_constrained+65>:	
    jne    0x813b1a0 <af_calc_insize_constrained+40>
0x813b1bb <af_calc_insize_constrained+67>:	test   %edi,%edi
0x813b1bd <af_calc_insize_constrained+69>:	
    je     0x813b1c3 <af_calc_insize_constrained+75>
---Type <return> to continue, or q <return> to quit---
0x813b1bf <af_calc_insize_constrained+71>:	test   %ebx,%ebx
0x813b1c1 <af_calc_insize_constrained+73>:	
    jne    0x813b1d0 <af_calc_insize_constrained+88>
0x813b1c3 <af_calc_insize_constrained+75>:	mov    $0xffffffff,%eax
End of assembler dump.
(gdb) info all-registers
eax            0x4235b	271195
ecx            0x10000	65536
edx            0x84c2190	139207056
ebx            0x0	0
esp            0xbfffe464	0xbfffe464
ebp            0xbfffe48c	0xbfffe48c
esi            0x4	4
edi            0x4800000	75497472
eip            0x813b1a6	0x813b1a6
eflags         0x210202	2163202
cs             0x23	35
ss             0x2b	43
ds             0x2b	43
es             0x2b	43
fs             0x0	0
gs             0x0	0
st0            -nan(0x8080808080808080)	(raw 0xffff8080808080808080)
st1            -1	(raw 0xbfff8000000000000000)
st2            0	(raw 0x00000000000000000000)
st3            0	(raw 0x00000000000000000000)
st4            0.017109722847739855451946675013452648	(raw 0x3ff98c29b08263ab5970)
st5            0.039999999105930328369140625	(raw 0x3ffaa3d70a0000000000)
---Type <return> to continue, or q <return> to quit---
st6            0	(raw 0x00000000000000000000)
st7            -13500.000536441802978515625	(raw 0xc00cd2f0008ca0000000)
fctrl          0x37f	895
fstat          0x120	288
ftag           0xffff	65535
fiseg          0x0	0
fioff          0x0	0
foseg          0x0	0
fooff          0x0	0
fop            0x0	0
xmm0           {f = {0x0, 0x0, 0x0, 0x0}}	{f = {-nan(0x7fffff), 
    -nan(0x7fffff), -nan(0x7fffff), -nan(0x7fffff)}}
xmm1           {f = {0x0, 0x0, 0x0, 0x0}}	{f = {-nan(0x7fffff), 
    -nan(0x7fffff), -nan(0x7fffff), -nan(0x7fffff)}}
xmm2           {f = {0x0, 0x0, 0x0, 0x0}}	{f = {-nan(0x7fffff), 
    -nan(0x7fffff), -nan(0x7fffff), -nan(0x7fffff)}}
xmm3           {f = {0x0, 0x0, 0x0, 0x0}}	{f = {-nan(0x7fffff), 
    -nan(0x7fffff), -nan(0x7fffff), -nan(0x7fffff)}}
xmm4           {f = {0x0, 0x0, 0x0, 0x0}}	{f = {-nan(0x7fffff), 
    -nan(0x7fffff), -nan(0x7fffff), -nan(0x7fffff)}}
xmm5           {f = {0x0, 0x0, 0x0, 0x0}}	{f = {-nan(0x7fffff), 
    -nan(0x7fffff), -nan(0x7fffff), -nan(0x7fffff)}}
xmm6           {f = {0x0, 0x0, 0x0, 0x0}}	{f = {-nan(0x7fffff), 
---Type <return> to continue, or q <return> to quit---
    -nan(0x7fffff), -nan(0x7fffff), -nan(0x7fffff)}}
xmm7           {f = {0x0, 0x0, 0x0, 0x0}}	{f = {-nan(0x7fffff), 
    -nan(0x7fffff), -nan(0x7fffff), -nan(0x7fffff)}}
mxcsr          0x1f80	8064
orig_eax       0xffffffff	-1
(gdb)