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Code Issues Releases Activity

Use FLG pseudo-random number generator in RoQ and ELBG

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Originally committed as revision 17881 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak
2009-03-08 17:43:12 +00:00
parent 74e2a0784e
commit 9aa2ab4276
4 changed files with 10 additions and 10 deletions
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10
libavcodec/elbg.c
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@@ -25,7 +25,7 @@
#include <string.h>
#include "libavutil/random.h"
#include "libavutil/lfg.h"
#include "elbg.h"
#include "avcodec.h"
@@ -52,7 +52,7 @@ typedef struct{
int *utility_inc;
int *nearest_cb;
int *points;
AVRandomState *rand_state;
AVLFG *rand_state;
} elbg_data;
static inline int distance_limited(int *a, int *b, int dim, int limit)
@@ -105,7 +105,7 @@ static int get_high_utility_cell(elbg_data *elbg)
{
int i=0;
/* Using linear search, do binary if it ever turns to be speed critical */
int r = av_random(elbg->rand_state)%(elbg->utility_inc[elbg->numCB-1]-1) + 1;
int r = av_lfg_get(elbg->rand_state)%(elbg->utility_inc[elbg->numCB-1]-1) + 1;
while (elbg->utility_inc[i] < r)
i++;
@@ -318,7 +318,7 @@ static void do_shiftings(elbg_data *elbg)
void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int max_steps, int *closest_cb,
AVRandomState *rand_state)
AVLFG *rand_state)
{
int i, k;
@@ -345,7 +345,7 @@ void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int max_steps, int *closest_cb,
AVRandomState *rand_state)
AVLFG *rand_state)
{
int dist;
elbg_data elbg_d;

4
libavcodec/elbg.h
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@@ -39,7 +39,7 @@
*/
void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int num_steps, int *closest_cb,
AVRandomState *rand_state);
AVLFG *rand_state);
/**
* Initialize the **codebook vector for the elbg algorithm. If you have already
@@ -50,6 +50,6 @@ void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
*/
void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int num_steps, int *closest_cb,
AVRandomState *rand_state);
AVLFG *rand_state);
#endif /* AVCODEC_ELBG_H */

4
libavcodec/roqvideo.h
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@@ -22,7 +22,7 @@
#ifndef AVCODEC_ROQVIDEO_H
#define AVCODEC_ROQVIDEO_H
#include "libavutil/random.h"
#include "libavutil/lfg.h"
#include "avcodec.h"
#include "dsputil.h"
@@ -58,7 +58,7 @@ typedef struct RoqContext {
int width, height;
/* Encoder only data */
AVRandomState randctx;
AVLFG randctx;
uint64_t lambda;
motion_vect *this_motion4;

2
libavcodec/roqvideoenc.c
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@@ -929,7 +929,7 @@ static int roq_encode_init(AVCodecContext *avctx)
{
RoqContext *enc = avctx->priv_data;
av_random_init(&enc->randctx, 1);
av_lfg_init(&enc->randctx, 1);
enc->framesSinceKeyframe = 0;
if ((avctx->width & 0xf) || (avctx->height & 0xf)) {