+int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
+ const uint8_t *mb_bitmask, const AVFrame *reference);
+int ff_mjpeg_find_marker(MJpegDecodeContext *s,
+ const uint8_t **buf_ptr, const uint8_t *buf_end,
+ const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);