/* Mask to determine which pixels are valid in a pass */
extern const uint8_t ff_png_pass_mask[NB_PASSES];
-extern void *ff_png_zalloc(void *opaque, unsigned int items,
- unsigned int size);
+void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size);
-extern void ff_png_zfree(void *opaque, void *ptr);
+void ff_png_zfree(void *opaque, void *ptr);
-extern int ff_png_get_nb_channels(int color_type);
+int ff_png_get_nb_channels(int color_type);
/* compute the row size of an interleaved pass */
-extern int ff_png_pass_row_size(int pass, int bits_per_pixel, int width);
+int ff_png_pass_row_size(int pass, int bits_per_pixel, int width);
#endif /* AVCODEC_PNG_H */