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Code Issues Releases Activity

Add a rounding parameter to ff_acelp_lp_synthesis_filter()

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Originally committed as revision 14028 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-06-29 11:19:50 +00:00
parent a6ce3d3d2d
commit 8a1c868ee6
2 changed files with 6 additions and 3 deletions
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5
libavcodec/acelp_filters.c
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@ -116,13 +116,14 @@ int ff_acelp_lp_synthesis_filter(
const int16_t* in, const int16_t* in,
int buffer_length, int buffer_length,
int filter_length, int filter_length,
int stop_on_overflow) int stop_on_overflow,
int rounder)
{ {
int i,n; int i,n;
for(n=0; n<buffer_length; n++) for(n=0; n<buffer_length; n++)
{ {
int sum = 0x800; int sum = rounder;
for(i=1; i<filter_length; i++) for(i=1; i<filter_length; i++)
sum -= filter_coeffs[i] * out[n-i]; sum -= filter_coeffs[i] * out[n-i];

4
libavcodec/acelp_filters.h
View File

@ -128,6 +128,7 @@ void ff_acelp_convolve_circ(
* \param filter_length filter length (11 for 10th order LP filter) * \param filter_length filter length (11 for 10th order LP filter)
* \param stop_on_overflow 1 - return immediately if overflow occurs * \param stop_on_overflow 1 - return immediately if overflow occurs
* 0 - ignore overflows * 0 - ignore overflows
* \param rounder the amount to add for rounding (usually 0x800 or 0xfff)
* *
* \return 1 if overflow occurred, 0 - otherwise * \return 1 if overflow occurred, 0 - otherwise
* *
@ -142,7 +143,8 @@ int ff_acelp_lp_synthesis_filter(
const int16_t* in, const int16_t* in,
int buffer_length, int buffer_length,
int filter_length, int filter_length,
int stop_on_overflow); int stop_on_overflow,
int rounder);
/** /**
* \brief Calculates coefficients of weighted A(z/weight) filter. * \brief Calculates coefficients of weighted A(z/weight) filter.