#include "elbg.h"
#include "avcodec.h"
-#define DELTA_ERR_MAX 0.1 ///< Precision of the ELBG algorithm (as percentual error)
+#define DELTA_ERR_MAX 0.1 ///< Precision of the ELBG algorithm (as percentage error)
/**
* In the ELBG jargon, a cell is the set of points that are closest to a
/**
* ELBG internal data
*/
-typedef struct{
+typedef struct elbg_data {
int error;
int dim;
int numCB;
/**
* Add the points in the low utility cell to its closest cell. Split the high
- * utility cell, putting the separed points in the (now empty) low utility
+ * utility cell, putting the separated points in the (now empty) low utility
* cell.
*
* @param elbg Internal elbg data
#define BIG_PRIME 433494437LL
-void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
- int numCB, int max_steps, int *closest_cb,
- AVLFG *rand_state)
+int ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
+ int numCB, int max_steps, int *closest_cb,
+ AVLFG *rand_state)
{
- int i, k;
+ int i, k, ret = 0;
if (numpoints > 24*numCB) {
/* ELBG is very costly for a big number of points. So if we have a lot
of them, get a good initial codebook to save on iterations */
int *temp_points = av_malloc(dim*(numpoints/8)*sizeof(int));
+ if (!temp_points)
+ return AVERROR(ENOMEM);
for (i=0; i<numpoints/8; i++) {
k = (i*BIG_PRIME) % numpoints;
memcpy(temp_points + i*dim, points + k*dim, dim*sizeof(int));
}
- ff_init_elbg(temp_points, dim, numpoints/8, codebook, numCB, 2*max_steps, closest_cb, rand_state);
- ff_do_elbg(temp_points, dim, numpoints/8, codebook, numCB, 2*max_steps, closest_cb, rand_state);
-
+ ret = ff_init_elbg(temp_points, dim, numpoints / 8, codebook,
+ numCB, 2 * max_steps, closest_cb, rand_state);
+ if (ret < 0) {
+ av_freep(&temp_points);
+ return ret;
+ }
+ ret = ff_do_elbg(temp_points, dim, numpoints / 8, codebook,
+ numCB, 2 * max_steps, closest_cb, rand_state);
av_free(temp_points);
} else // If not, initialize the codebook with random positions
for (i=0; i < numCB; i++)
memcpy(codebook + i*dim, points + ((i*BIG_PRIME)%numpoints)*dim,
dim*sizeof(int));
-
+ return ret;
}
-void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
+int ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int max_steps, int *closest_cb,
AVLFG *rand_state)
{
int dist;
elbg_data elbg_d;
elbg_data *elbg = &elbg_d;
- int i, j, k, last_error, steps=0;
+ int i, j, k, last_error, steps = 0, ret = 0;
int *dist_cb = av_malloc(numpoints*sizeof(int));
int *size_part = av_malloc(numCB*sizeof(int));
cell *list_buffer = av_malloc(numpoints*sizeof(cell));
elbg->utility_inc = av_malloc(numCB*sizeof(int));
elbg->scratchbuf = av_malloc(5*dim*sizeof(int));
+ if (!dist_cb || !size_part || !list_buffer || !elbg->cells ||
+ !elbg->utility || !elbg->utility_inc || !elbg->scratchbuf) {
+ ret = AVERROR(ENOMEM);
+ goto out;
+ }
+
elbg->rand_state = rand_state;
do {
} while(((last_error - elbg->error) > DELTA_ERR_MAX*elbg->error) &&
(steps < max_steps));
+out:
av_free(dist_cb);
av_free(size_part);
av_free(elbg->utility);
av_free(elbg->cells);
av_free(elbg->utility_inc);
av_free(elbg->scratchbuf);
+ return ret;
}