+static void shrink_palette(const uint32_t *src, uint8_t *map,
+ uint32_t *dst, size_t *palette_count)
+{
+ size_t colors_seen = 0;
+
+ for (size_t i = 0; i < AVPALETTE_COUNT; i++) {
+ int seen = 0;
+ for (size_t c = 0; c < colors_seen; c++) {
+ if (src[i] == dst[c]) {
+ seen = 1;
+ break;
+ }
+ }
+ if (!seen) {
+ dst[colors_seen] = src[i];
+ map[i] = colors_seen;
+ colors_seen++;
+ }
+ }
+
+ *palette_count = colors_seen;
+}
+
+static void remap_frame_to_palette(const uint8_t *src, int src_linesize,
+ uint8_t *dst, int dst_linesize,
+ int w, int h, uint8_t *map)
+{
+ for (int i = 0; i < h; i++)
+ for (int j = 0; j < w; j++)
+ dst[i * dst_linesize + j] = map[src[i * src_linesize + j]];
+}
+