ff_png_zalloc      58 libavcodec/png.h void *ff_png_zalloc(void *opaque, unsigned int items, unsigned int size);
ff_png_zalloc     423 libavcodec/pngdec.c     zstream.zalloc = ff_png_zalloc;
ff_png_zalloc    1128 libavcodec/pngdec.c     s->zstream.zalloc = ff_png_zalloc;
ff_png_zalloc    1175 libavcodec/pngdec.c         s->zstream.zalloc = ff_png_zalloc;
ff_png_zalloc     351 libavcodec/pngenc.c     s->zstream.zalloc = ff_png_zalloc;