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Code Issues Releases Activity

Use ff_acelp_lp_synthesis_filter() instead of duplicating it

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Originally committed as revision 14029 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-06-29 11:21:06 +00:00
parent 8a1c868ee6
commit 95fc77b92d
2 changed files with 8 additions and 35 deletions
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2
libavcodec/Makefile
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@ -148,7 +148,7 @@ OBJS-$(CONFIG_QDRAW_DECODER) += qdrw.o
OBJS-$(CONFIG_QPEG_DECODER) += qpeg.o OBJS-$(CONFIG_QPEG_DECODER) += qpeg.o
OBJS-$(CONFIG_QTRLE_DECODER) += qtrle.o OBJS-$(CONFIG_QTRLE_DECODER) += qtrle.o
OBJS-$(CONFIG_QTRLE_ENCODER) += qtrleenc.o OBJS-$(CONFIG_QTRLE_ENCODER) += qtrleenc.o
OBJS-$(CONFIG_RA_144_DECODER) += ra144.o OBJS-$(CONFIG_RA_144_DECODER) += ra144.o acelp_filters.o
OBJS-$(CONFIG_RA_288_DECODER) += ra288.o OBJS-$(CONFIG_RA_288_DECODER) += ra288.o
OBJS-$(CONFIG_RAWVIDEO_DECODER) += rawdec.o OBJS-$(CONFIG_RAWVIDEO_DECODER) += rawdec.o
OBJS-$(CONFIG_RAWVIDEO_ENCODER) += rawenc.o OBJS-$(CONFIG_RAWVIDEO_ENCODER) += rawenc.o

41
libavcodec/ra144.c
View File

@ -22,6 +22,7 @@
#include "avcodec.h" #include "avcodec.h"
#include "bitstream.h" #include "bitstream.h"
#include "ra144.h" #include "ra144.h"
#include "acelp_filters.h"
#define NBLOCKS 4 ///< number of subblocks within a block #define NBLOCKS 4 ///< number of subblocks within a block
#define BLOCKSIZE 40 ///< subblock size in 16-bit words #define BLOCKSIZE 40 ///< subblock size in 16-bit words
@ -140,39 +141,6 @@ static void add_wav(int16_t *dest, int n, int skip_first, int *m,
dest[i] = (s1[i]*v[0] + s2[i]*v[1] + s3[i]*v[2]) >> 12; dest[i] = (s1[i]*v[0] + s2[i]*v[1] + s3[i]*v[2]) >> 12;
} }
/**
* LPC Filter. Each output value is predicted from the 10 previous computed
* ones. It overwrites the input with the output.
*
* @param in the input of the filter. It should be an array of size len + 10.
* The 10 first input values are used to evaluate the first filtered one.
*/
static void lpc_filter(uint16_t *in, const int16_t *lpc_coefs, int len)
{
int x, i;
int16_t *ptr = in;
for (i=0; i<len; i++) {
int sum = 0;
int new_val;
for(x=0; x<10; x++)
sum += lpc_coefs[9-x] * ptr[x];
sum >>= 12;
new_val = ptr[10] - sum;
if (new_val < -32768 || new_val > 32767) {
memset(in, 0, 50*sizeof(*in));
return;
}
ptr[10] = new_val;
ptr++;
}
}
static unsigned int rescale_rms(unsigned int rms, unsigned int energy) static unsigned int rescale_rms(unsigned int rms, unsigned int energy)
{ {
return (rms * energy) >> 10; return (rms * energy) >> 10;
@ -237,7 +205,12 @@ static void do_output_subblock(RA144Context *ractx, const uint16_t *lpc_coefs,
memcpy(ractx->curr_sblock + 10, block, memcpy(ractx->curr_sblock + 10, block,
BLOCKSIZE*sizeof(*ractx->curr_sblock)); BLOCKSIZE*sizeof(*ractx->curr_sblock));
lpc_filter(ractx->curr_sblock, lpc_coefs, BLOCKSIZE); if (ff_acelp_lp_synthesis_filter(
ractx->curr_sblock + 10, lpc_coefs -1,
ractx->curr_sblock + 10, BLOCKSIZE,
11, 1, 0xfff)
)
memset(ractx->curr_sblock, 0, 50*sizeof(*ractx->curr_sblock));
} }
static void int_to_int16(int16_t *out, const int *inp) static void int_to_int16(int16_t *out, const int *inp)