void 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;
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));
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);
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));
}
static void generate_codebook(RoqContext *enc, RoqTempdata *tempdata,
int *points, int inputCount, roq_cell *results,
int size, int cbsize)
{
int i, j, k;
int c_size = size*size/4;
int *buf;
int *codebook = av_malloc(6*c_size*cbsize*sizeof(int));
int *closest_cb;
if (size == 4)
closest_cb = av_malloc(6*c_size*inputCount*sizeof(int));
else
closest_cb = tempdata->closest_cb2;
ff_init_elbg(points, 6*c_size, inputCount, codebook, cbsize, 1, closest_cb, &enc->randctx);
ff_do_elbg(points, 6*c_size, inputCount, codebook, cbsize, 1, closest_cb, &enc->randctx);
if (size == 4)
av_free(closest_cb);
buf = codebook;
for (i=0; i<cbsize; i++)
for (k=0; k<c_size; k++) {
for(j=0; j<4; j++)
results->y[j] = *buf++;
results->u = (*buf++ + CHROMA_BIAS/2)/CHROMA_BIAS;
results->v = (*buf++ + CHROMA_BIAS/2)/CHROMA_BIAS;
results++;
}
av_free(codebook);
}
static int a64multi_encode_frame(AVCodecContext *avctx, unsigned char *buf,
int buf_size, void *data)
{
A64Context *c = avctx->priv_data;
AVFrame *pict = data;
AVFrame *const p = (AVFrame *) & c->picture;
int frame;
int a;
uint8_t colrammap[256];
int *charmap = c->mc_charmap;
int *meta = c->mc_meta_charset;
int *best_cb = c->mc_best_cb;
int frm_size = 0x400 + 0x400 * c->mc_use_5col;
int req_size;
/* it is the last frame so prepare to flush */
if (!data)
c->mc_lifetime = c->mc_frame_counter;
req_size = 0x800 + frm_size * c->mc_lifetime;
if (req_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "buf size too small (need %d, got %d)\n", req_size, buf_size);
return -1;
}
/* fill up mc_meta_charset with framedata until lifetime exceeds */
if (c->mc_frame_counter < c->mc_lifetime) {
*p = *pict;
p->pict_type = FF_I_TYPE;
p->key_frame = 1;
to_meta_with_crop(avctx, p, meta + 32000 * c->mc_frame_counter);
c->mc_frame_counter++;
/* lifetime is not reached */
return 0;
}
/* lifetime exceeded so now convert X frames at once */
if (c->mc_frame_counter == c->mc_lifetime && c->mc_lifetime > 0) {
c->mc_frame_counter = 0;
ff_init_elbg(meta, 32, 1000 * c-> mc_lifetime, best_cb, 256, 5, charmap, &c->randctx);
ff_do_elbg (meta, 32, 1000 * c-> mc_lifetime, best_cb, 256, 5, charmap, &c->randctx);
render_charset(avctx, buf, colrammap);
for (frame = 0; frame < c->mc_lifetime; frame++) {
for (a = 0; a < 1000; a++) {
buf[0x800 + a] = charmap[a];
if (c->mc_use_5col) buf[0xc00 + a] = colrammap[charmap[a]];
}
buf += frm_size;
charmap += 1000;
}
return req_size;
}
return 0;
}