avcodec/elbg: Add flags to avpriv_elbg_do()

This is currently unused and it is only added to enable changes
while maintaining ABI compatibility. The type is uintptr_t in order
to potentially accept a pointer argument.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/a64multienc.c

@@ -338,7 +338,7 @@ static int a64multi_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 
             /* calc optimal new charset + charmaps */
             ret = avpriv_elbg_do(&c->elbg, meta, 32, 1000 * c->mc_lifetime,
-                                 best_cb, CHARSET_CHARS, 50, charmap, &c->randctx);
+                                 best_cb, CHARSET_CHARS, 50, charmap, &c->randctx, 0);
             if (ret < 0)
                 return ret;
 

libavcodec/cinepakenc.c

@@ -764,7 +764,7 @@ static int quantize(CinepakEncContext *s, int h, uint8_t *data[4],
         size = i;
 
     ret = avpriv_elbg_do(&s->elbg, s->codebook_input, entry_size, i, codebook,
-                         size, 1, s->codebook_closest, &s->randctx);
+                         size, 1, s->codebook_closest, &s->randctx, 0);
     if (ret < 0)
         return ret;
 

libavcodec/elbg.c

@@ -445,7 +445,7 @@ static void init_elbg(ELBGContext *elbg, int *points, int *temp_points,
 
 int avpriv_elbg_do(ELBGContext **elbgp, int *points, int dim, int numpoints,
                    int *codebook, int num_cb, int max_steps,
-                   int *closest_cb, AVLFG *rand_state)
+                   int *closest_cb, AVLFG *rand_state, uintptr_t flags)
 {
     ELBGContext *const elbg = *elbgp ? *elbgp : av_mallocz(sizeof(*elbg));
 

libavcodec/elbg.h

@@ -21,6 +21,7 @@
 #ifndef AVCODEC_ELBG_H
 #define AVCODEC_ELBG_H
 
+#include <stdint.h>
 #include "libavutil/lfg.h"
 
 struct ELBGContext;
@@ -41,11 +42,12 @@ struct ELBGContext;
  * @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().
+ * @param flags Currently unused; must be set to 0.
  * @return < 0 in case of error, 0 otherwise
  */
 int avpriv_elbg_do(struct ELBGContext **ctx, int *points, int dim,
                    int numpoints, int *codebook, int num_cb, int num_steps,
-                   int *closest_cb, AVLFG *rand_state);
+                   int *closest_cb, AVLFG *rand_state, uintptr_t flags);
 
 /**
  * Free an ELBGContext and reset the pointer to it.

libavcodec/msvideo1enc.c

@@ -119,7 +119,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
             // try to find optimal value to fill whole 4x4 block
             score = 0;
             ret = avpriv_elbg_do(&c->elbg, c->block, 3, 16, c->avg,
-                                 1, 1, c->output, &c->rnd);
+                                 1, 1, c->output, &c->rnd, 0);
             if (ret < 0)
                 return ret;
             if(c->avg[0] == 1) // red component = 1 will be written as skip code
@@ -141,7 +141,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
             // search for optimal filling of 2-color block
             score = 0;
             ret = avpriv_elbg_do(&c->elbg, c->block, 3, 16, c->codebook,
-                                 2, 1, c->output, &c->rnd);
+                                 2, 1, c->output, &c->rnd, 0);
             if (ret < 0)
                 return ret;
             // last output value should be always 1, swap codebooks if needed
@@ -170,7 +170,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
             for(i = 0; i < 4; i++){
                 ret = avpriv_elbg_do(&c->elbg, c->block2 + i * 4 * 3, 3, 4,
                                      c->codebook2 + i * 2 * 3, 2, 1,
-                                     c->output2 + i * 4, &c->rnd);
+                                     c->output2 + i * 4, &c->rnd, 0);
                 if (ret < 0)
                     return ret;
             }

libavcodec/roqvideoenc.c

@@ -826,7 +826,7 @@ static int generate_codebook(RoqEncContext *enc,
     int *closest_cb = enc->closest_cb;
 
     ret = avpriv_elbg_do(&enc->elbg, points, 6 * c_size, inputCount, codebook,
-                         cbsize, 1, closest_cb, &enc->randctx);
+                         cbsize, 1, closest_cb, &enc->randctx, 0);
     if (ret < 0)
         return ret;
 

libavfilter/vf_elbg.c

@@ -167,7 +167,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
     ret = avpriv_elbg_do(&elbg->ctx, elbg->codeword, NB_COMPONENTS,
                          elbg->codeword_length, elbg->codebook,
                          elbg->codebook_length, elbg->max_steps_nb,
-                         elbg->codeword_closest_codebook_idxs, &elbg->lfg);
+                         elbg->codeword_closest_codebook_idxs, &elbg->lfg, 0);
     if (ret < 0) {
         av_frame_free(&frame);
         return ret;