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Code Issues Releases Activity

elbg: check memory allocations and propagate errors

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This commit is contained in:
Vittorio Giovara 2014-12-16 10:33:36 +01:00
parent 5d839778b9
commit ae2d41ec87
2 changed files with 33 additions and 16 deletions
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35
libavcodec/elbg.c
View File

@ -323,41 +323,48 @@ static void do_shiftings(elbg_data *elbg)
#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));
@ -375,6 +382,12 @@ void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
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 {
@ -427,6 +440,7 @@ void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
} 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);
@ -434,4 +448,5 @@ void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
av_free(elbg->cells);
av_free(elbg->utility_inc);
av_free(elbg->scratchbuf);
return ret;
}

14
libavcodec/elbg.h
View File

@ -36,10 +36,11 @@
* @param num_steps The maximum number of steps. One step is already a good compromise between time and quality.
* @param closest_cb Return the closest codebook to each point. Must be allocated.
* @param rand_state A random number generator state. Should be already initialized by av_lfg_init().
* @return < 0 in case of error, 0 otherwise
*/
void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int num_steps, int *closest_cb,
AVLFG *rand_state);
int ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int num_steps, int *closest_cb,
AVLFG *rand_state);
/**
* Initialize the **codebook vector for the elbg algorithm. If you have already
@ -47,9 +48,10 @@ void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
* If numpoints < 8*numCB this function fills **codebook with random numbers.
* If not, it calls ff_do_elbg for a (smaller) random sample of the points in
* **points. Get the same parameters as ff_do_elbg.
* @return < 0 in case of error, 0 otherwise
*/
void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int num_steps, int *closest_cb,
AVLFG *rand_state);
int ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int num_steps, int *closest_cb,
AVLFG *rand_state);
#endif /* AVCODEC_ELBG_H */